Table of Contents
The United States Constitution guarantees freedom of religion as one of the most fundamental rights in American democracy. This protection is primarily outlined in the First Amendment, which contains two distinct but complementary provisions: the Establishment Clause and the Free Exercise Clause. Together, these clauses create a constitutional framework that ensures individuals can practice their faith freely without government interference while preventing the government from favoring or establishing any particular religion.
Understanding the First Amendment’s Religion Clauses
The First Amendment states: “Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof.” These sixteen words have shaped American religious liberty for more than two centuries, establishing a unique relationship between government and religion that distinguishes the United States from many other nations.
The first two provisions of the First Amendment, known as the Religion Clauses, state that Congress shall make no law respecting an establishment of religion or prohibiting the free exercise thereof. The Establishment and Free Exercise Clauses were ratified as part of the Bill of Rights in 1791. While originally applying only to the federal government, these protections were later extended to state and local governments through the incorporation doctrine.
The Establishment Clause
The Establishment Clause is a limitation placed upon the United States Congress preventing it from passing legislation establishing an official religion and, by interpretation, makes it illegal for the government to promote theocracy or promote a specific religion with taxes. This clause addresses concerns that existed at the founding of the nation, when members of minority faiths did not want the federal government to establish a state religion for the entire nation.
The establishment clause prohibits the government from endorsing, supporting, or becoming too involved in religion and religious activities. This principle has been interpreted to mean that government must maintain neutrality toward religion, neither favoring nor disfavoring religious belief or practice.
The Free Exercise Clause
The First Amendment’s Free Exercise Clause forbids Congress from prohibiting the free exercise of religion. Free exercise is the liberty of persons to reach, hold, practice and change beliefs freely according to the dictates of conscience. This protection extends beyond mere belief to encompass religious practice and conduct.
The Free Exercise Clause prohibits government interference with religious belief and, within limits, religious practice. The freedom to hold religious beliefs and opinions is absolute. Federal or state legislation cannot therefore make it a crime to hold any religious belief or opinion due to the Free Exercise Clause.
The Relationship Between the Two Clauses
The Free Exercise Clause is concerned with “governmental compulsion,” while the Establishment Clause is “violated by laws which establish an official religion whether those laws operate directly to coerce nonobserving individuals or not.” Both clauses protect the same values, and often a violation of one would also be a violation of the other.
However, these two clauses can sometimes create tension. If the government goes too far in protecting one, it risks violating the other. For example, if the government refuses to provide certain services (i.e., fire and police protection) to churches, that might violate the free exercise clause. If the government provides too many services to churches (perhaps extra security for a church event), it risks violating the establishment clause.
Historical Background and Development
Colonial Foundations
The concept of religious freedom in America has deep historical roots that predate the Constitution. In 1681, Pennsylvania was founded with no established religion and with protections for religious freedom. In the 1700s, other colonies granted full or partial religious freedom. These early experiments in religious tolerance laid the groundwork for the constitutional protections that would follow.
A possible additional precursor of the Free Exercise Clause was the Virginia Statute for Religious Freedom. The statute was drafted by Thomas Jefferson in 1777 and was introduced in the Virginia General Assembly in 1779. It did not pass the General Assembly until 1786. James Madison played an important role in its passage. The statute disestablished the Church of England in Virginia and guaranteed freedom of religion exercise to men of all religious faiths, including Catholics and Jews as well as members of all Protestant denominations.
Incorporation to the States
Prior to the enactment of the Fourteenth Amendment to the United States Constitution in 1868, the Supreme Court generally held that the substantive protections of the Bill of Rights did not apply to state governments. Subsequently, by the Incorporation doctrine, the Bill of Rights has been broadly applied to limit state and local government as well.
In 1940, the Supreme Court applied the free exercise clause to the states (Cantwell v. Connecticut). The Establishment Clause was incorporated in Everson v. Bd. of Educ., 330 U.S. 1, 8 (1947), while the Free Exercise Clause was incorporated in Cantwell v. Connecticut, 310 U.S. 296, 303 (1940). This incorporation meant that state and local governments, not just the federal government, were bound by the Religion Clauses.
Legal Standards and Tests
The Lemon Test for Establishment Clause Cases
For many years, courts applied a specific framework to evaluate whether government action violated the Establishment Clause. The Supreme Court created a three-part test to evaluate Establishment Clause cases. Laws that are constitutional under the First Amendment: (1) must have a secular purpose; (2) must have a principal or primary effect that neither advances nor inhibits religion; (3) must not foster an excessive government entanglement with religion.
This test, known as the Lemon test after the 1971 case Lemon v. Kurtzman, guided Establishment Clause jurisprudence for decades. However, the Court abandoned the Lemon test and related tests, and replaced it with consideration to “historical practices and understandings” in more recent decisions.
Free Exercise Standards: From Strict Scrutiny to Neutrality
The legal standard for evaluating Free Exercise claims has evolved significantly over time. The Court began to apply a standard of “strict scrutiny” in various areas of civil rights law, reading the Free Exercise Clause to require accommodation of religious conduct except where a state could show a compelling interest and no less burdensome means to achieve that end.
The prevailing standard governing most laws was established in 1990’s Employment Division v. Smith, in which the Supreme Court ruled that the right of free exercise does not relieve an individual of the obligation to comply with a ‘valid and neutral law of general applicability on the ground that the law proscribes (or prescribes) conduct that his religion prescribes (or proscribes).’ This marked a significant shift in Free Exercise jurisprudence.
Even after Smith, though, a law that imposes special burdens on religious activities may not be considered neutral or generally applicable and will likely trigger heightened scrutiny. The government is “generally free to place incidental burdens on religious exercise” so long as its policy is neutral and generally applicable. If a government policy is not neutral or generally applicable, modern Free Exercise Clause jurisprudence instructs courts to apply strict scrutiny, meaning the government must prove its action “advances compelling interests and is narrowly tailored to achieve those interests.”
The Religious Freedom Restoration Act
The Court’s abandonment of the strict scrutiny test was followed by intense disapproval from Congress and the passage of the Religious Freedom Restoration Act in 1993 to attempt to restore the prior test. The Religious Freedom Restoration Act became law in response to Employment Division Department of Human Resources of Oregon v. Smith. The act was essentially a rebuttal of 1990’s Smith ruling. It requires laws that restrict religious freedom to pass strict scrutiny, the highest form of constitutional analysis. If the government seeks to limit someone’s religious exercise, laws must be based on a “compelling governmental interest” and carried out by the “least restrictive means” possible.
In City of Boerne v. Flores, the Supreme Court struck down the act as applied to the States, holding that it unconstitutionally attempted to usurp the Supreme Court’s role in interpreting the Constitution, thus leaving the Smith test in place. However, RFRA continues to apply to federal government actions.
The Religious Land Use and Institutionalized Persons Act, which Congress adopted by unanimous consent in 2000, is often referred to as a sister statute because of its similarities. Notably, it forbids governments, or their agents, from imposing unnecessary “substantial burden[s]” on the “religious exercise” rights of those who are incarcerated.
Landmark Supreme Court Cases
Early Cases: Defining the Boundaries
Reynolds v. United States (1878)
In 1878, the Supreme Court was first called to interpret the extent of the Free Exercise Clause in Reynolds v. United States, as related to the prosecution of polygamy under federal law. The Supreme Court upheld Reynolds’ conviction for bigamy, deciding that to do otherwise would provide constitutional protection for a gamut of religious beliefs, including those as extreme as human sacrifice.
The Court said: “Laws are made for the government of actions, and while they cannot interfere with mere religious beliefs and opinions, they may with practices.” This established an important distinction between religious belief, which receives absolute protection, and religious conduct, which may be regulated under certain circumstances.
Everson v. Board of Education (1947)
This case marked the first time the Supreme Court applied the Establishment Clause to state governments. The case involved a New Jersey law that reimbursed parents for transportation costs to send their children to school, including parochial schools. The Court upheld the law, finding it did not violate the Establishment Clause because it provided a general benefit to all students regardless of the religious nature of their schools.
The Warren Court Era: Expanding Protections
Engel v. Vitale (1962)
State officials may not compose an official state prayer and require that it be recited in public schools, even if the prayer is denominationally neutral, and even if students may remain silent or be excused. In 1962, the Supreme Court held that a school policy of having a daily prayer violated the establishment clause, even though the prayer was non-denominational and students were not compelled to participate. This decision has been severely criticized by some politicians and religious leaders and has led to several unsuccessful attempts to amend the Constitution.
Abington School District v. Schempp (1963)
No state law or school board may require that passages from the Bible be read or that the Lord’s Prayer be recited in public schools, even if students may be excused from attending or participating upon written request of their parents. This case further reinforced the prohibition against religious exercises in public schools.
Sherbert v. Verner (1963)
In Sherbert v. Verner, the Court overturned the state Employment Security Commission’s decision to deny unemployment benefits to a practicing member of the Seventh-day Adventist Church who was forced out of a job after her employer adopted a 6-day work week, which would have required her to work on Saturdays against the dictates of her religion. As Justice William Brennan stated for the majority, “to condition the availability of benefits upon this appellant’s willingness to violate a cardinal principle of her religious faith effectively penalizes the free exercise of her constitutional liberties.”
Wisconsin v. Yoder (1972)
In this case, the Supreme Court held that Amish parents could not be compelled to send their children to public school beyond the eighth grade, as this would violate their religious beliefs about education and community. The Court found that the state’s interest in compulsory education did not outweigh the parents’ fundamental right to direct the religious upbringing of their children.
Lemon v. Kurtzman (1971)
This case established the three-part test for evaluating Establishment Clause violations that would guide courts for decades. The case involved state programs that provided financial support to religious schools for secular educational purposes. The Court struck down these programs, establishing the framework that laws must have a secular purpose, must not primarily advance or inhibit religion, and must not foster excessive government entanglement with religion.
The Shift: Employment Division v. Smith (1990)
This case marked a significant turning point in Free Exercise jurisprudence. The Court held that neutral laws of general applicability do not violate the Free Exercise Clause even if they incidentally burden religious practice. The case involved two Native American men who were fired from their jobs and denied unemployment benefits after using peyote as part of a religious ceremony. The Court’s decision significantly reduced the level of protection for religious practices under the Free Exercise Clause, leading to the passage of RFRA.
Church of Lukumi Babalu Aye v. City of Hialeah (1993)
The Supreme Court stated that inquiries about whether laws discriminate based on religion don’t end with the text of the laws at issue. Facial neutrality of laws is not determinative in these inquiries, because both the Free Exercise Clause and the Establishment Clause extend beyond facial discrimination. The case said that a city ordinance against animal sacrifice practiced by a new church violated the First Amendment.
Recent Developments: The 21st Century
Burwell v. Hobby Lobby Stores, Inc. (2014)
The Religious Freedom Restoration Act (RFRA) permits a closely held for-profit corporation to deny its employees the health coverage of contraceptives to which the employees are otherwise entitled by the federal Patient Protection and Affordable Care Act, based on the religious objections of the corporation’s owners. More generally, protecting the free exercise rights of closely held corporations protects the religious liberty of the people who own and control them.
Trinity Lutheran, Espinoza, and Carson: The School Funding Trilogy
Three key decisions have driven this shift: Trinity Lutheran Church of Columbia, Inc. v. Comer (2017), Espinoza v. Montana Department of Revenue (2020), and Carson v. Makin (2022). These cases progressively expanded the principle that religious organizations cannot be excluded from generally available government benefit programs solely because of their religious status or use.
The Supreme Court in Carson v. Makin ruled in June 2022 that Maine’s tuition reimbursement program could not exclude parents who sent their children to religious schools. This case represented a significant expansion of the principle that religious discrimination in public benefit programs violates the Free Exercise Clause.
Kennedy v. Bremerton School District (2022)
The issue of prayer in schools came to the forefront in the case of Kennedy v. Bremerton School District (2022). In a 5–4 decision, the court upheld the right of a public high school football coach to lead his team in prayer during and after games. The Court determined that the coach’s prayer constituted protected speech, and that the school’s ban on this prayer violated the coach’s First Amendment rights and right to religious expression.
COVID-19 Pandemic Cases
The U.S. Supreme Court in a split 5-4 decision on Nov. 25, 2020, blocked New York’s COVID-19 restrictions on the size of religious gatherings, saying although the state had a compelling interest of public health, the rules struck at the heart of religious liberty. This case, Roman Catholic Diocese of Brooklyn v. Cuomo, signaled the Court’s willingness to apply heightened scrutiny to laws that treat religious gatherings differently from comparable secular activities.
Mahmoud v. Taylor (2025)
In a 6-3 decision authored by Justice Alito, the Supreme Court reversed the Fourth Circuit, holding that the parents were entitled to a preliminary injunction because the introduction of the storybooks, along with the Board’s decision to withhold opt-outs, unconstitutionally burdened the parents’ religious exercise. The Court first addressed the nature of the burden at issue, reiterating that the Free Exercise Clause protects the ability to engage in religious acts, and “for many people … there are few religious acts more important than the religious education of their children.”
The Court concluded that a government action that substantially interferes with the religious development of a child or poses “a very real threat of undermining” the religious beliefs a parent wishes to instill in his or her child should be reviewed under a heightened constitutional standard—strict scrutiny—regardless of whether the action is neutral and generally applicable.
Key Areas of Application
Religion in Public Schools
The Supreme Court has held very firm in keeping prayer and other religious activities out of school and official school functions. It has held that schools may not have daily Bible readings, or moments of silence for meditation or prayer, or prayers at school graduations, or even student-initiated and led prayers at a high school football game.
However, the Court has also recognized that not all religious expression in schools is prohibited. Students retain their individual rights to religious expression, and schools must be careful not to discriminate against religious viewpoints in otherwise open forums.
Government Funding and Religious Institutions
While the Court has prevented states from directly funding parochial schools, it has not stopped them from aiding religious colleges and universities. In Tilton v. Richardson (1971), the Court permitted the use of public funds for the construction of facilities in religious institutions of higher learning. It was found that there was no “excessive entanglement” since the buildings were themselves not religious, unlike teachers in parochial schools, and because the aid came in the form of a one-time grant, rather than continuous assistance.
One of the largest recent controversies over the amendment centered on school vouchers—government aid for students to attend private and predominantly religious schools. The Supreme Court, in Zelman v. Simmons-Harris (2002), upheld the constitutionality of private school vouchers, turning away an Establishment Clause challenge.
Religious Displays on Public Property
The constitutionality of religious displays on government property has been a recurring issue. In Allegheny County v. Greater Pittsburgh ACLU, the county government had erected two displays during the Christmas season. One was a nativity scene (crèche) and the other was an outside display featuring a Christmas tree, a menorah (symbolizing Chanukah) and a sign saluting liberty during the holiday season. They held that the crèche was unconstitutional because it was likely to be viewed as an endorsement of Christianity. The other display, containing symbols of two religions and an acknowledgement of freedom, was considered a reasonable approach to acknowledging a holiday with both religious and cultural aspects and not an endorsement of religion.
Religious Freedom in Prisons
Incarcerated individuals retain certain religious freedom rights, though these may be limited by legitimate penological interests. The Religious Land Use and Institutionalized Persons Act provides specific protections for prisoners’ religious exercise, prohibiting substantial burdens on religious practice unless the government can demonstrate a compelling interest achieved through the least restrictive means.
Employment and Religious Accommodation
The intersection of employment law and religious freedom has produced numerous important cases. Employers must reasonably accommodate employees’ religious practices unless doing so would create an undue hardship. The ministerial exception, recognized by the Supreme Court, prevents courts from interfering in employment decisions regarding ministers and other religious leaders.
The Establishment and Free Exercise Clauses bar lawsuits brought on behalf of ministers against their churches, claiming termination in violation of employment discrimination laws. This principle protects religious organizations’ autonomy in selecting their spiritual leaders.
Contemporary Issues and Debates
Religious Liberty vs. LGBTQ Rights
One of the most contentious areas in contemporary religious freedom jurisprudence involves conflicts between religious liberty claims and laws protecting LGBTQ individuals from discrimination. Cases involving wedding vendors, adoption agencies, and other service providers have raised difficult questions about how to balance these competing interests.
The Hobby Lobby decision and subsequent cases have highlighted tensions between religious objections to providing certain services or benefits and anti-discrimination principles. Courts continue to grapple with how to resolve these conflicts in ways that respect both religious freedom and equality principles.
Religious Charter Schools
Oklahoma Attorney General Gentner Drummond said that the state charter school board violated the state and U.S. constitutions and Oklahoma law when it approved a contract with the St. Isidore of Seville Virtual Charter School Inc. to establish a state-funded, religious charter school. St. Isidore planned to operate the charter school as a Catholic school. The Oklahoma Supreme Court agreed with Drummond. The state court said, “the expenditure of state funds for St. Isidore’s operations constitutes the use of state funds for the benefit and support of the Catholic church,” and that violates the “plain terms” of the state constitution.
Parental Rights and School Curriculum
Recent cases have addressed parents’ rights to control their children’s exposure to certain educational content that conflicts with their religious beliefs. The Mahmoud v. Taylor case represents a significant development in this area, affirming parents’ constitutional right to direct the religious upbringing of their children even in public school settings.
Religious Tax Exemptions
Questions about which organizations qualify for religious tax exemptions continue to arise. Catholic Charities Bureau v. Wisconsin Labor & Industry Review Commission is an appeal by Catholic Charities of a Wisconsin Supreme Court decision upholding a denial of an exemption from the state’s unemployment tax. The state court held that Catholic Charities (an arm of the Catholic diocese) was not “operated primarily for religious purposes” as required for the tax exemption under the state statute, and its activities, instead, were “primarily charitable and secular” rather than religious.
The Evolving Interpretation of Religious Freedom
The evolving interpretation of religious freedom by the Supreme Court reflects ongoing debates about the balance between individual rights and governmental interests. The Court’s approach to religious freedom cases has shifted significantly over the decades, from the strict separationism of the mid-20th century to a more accommodationist approach in recent years.
The Roberts Court’s conservative majority seems to have a somewhat insatiable appetite for religion cases, particularly those involving the Free Exercise clause. Some scholars who follow the Court’s religion decisions closely believe the majority has elevated that clause above the Establishment clause by showing little concern for government entanglement with religion.
Practical Implications for Americans
Individual Rights
Under the free exercise clause, religious individuals have the right to follow their faith by running for public office or advocating for laws consistent with their values. The religion clauses of the First Amendment — no establishment and free exercise — protect the right of people of all faiths and beliefs to practice any religion or no religion, free from government interference. This constitutional framework makes possible peaceful coexistence across deep religious and ideological differences. Despite outbreaks of religious division and conflict in our history, the United States remains today a bold and successful experiment in religious freedom, thanks to the First Amendment.
Defining Religion
In interpreting the First Amendment, it is sometimes necessary to define religion. The courts have generally given a very broad definition to the term. Religious beliefs are protected even when they do not conform to the dogma of any particular religion.
In 1965, the Supreme Court expanded the concept of religion that is protected under the First Amendment in a case involving a conscientious objector who did not believe in a single Supreme Being. In United States v. Seeger, the Court moved away from requiring a theistic belief to qualify for protection of religious freedom.
Limits on Religious Practice
While religious belief receives absolute protection, religious conduct may be subject to reasonable regulation. The court went on to echo Reynolds in the 1890 case Davis v. Beason: “However free the exercise of religion may be, it must be subordinate to the criminal laws of the country, passed with reference to actions regarded by general consent as properly the subjects of punitive legislation.”
The government may regulate religious conduct when it has a compelling interest and uses the least restrictive means available, particularly when laws specifically target religious practice. However, neutral laws of general applicability typically do not violate the Free Exercise Clause even if they incidentally burden religious practice.
Looking Forward
The constitutional protection of religious freedom continues to evolve as courts address new challenges and changing social contexts. Recent Supreme Court decisions suggest a trend toward greater accommodation of religious exercise and less tolerance for government actions that discriminate against religion, even indirectly.
Key questions remain unresolved, including how to balance religious freedom with other constitutional rights, the extent to which religious organizations can claim exemptions from generally applicable laws, and the proper role of religion in public life. As American society becomes increasingly diverse in its religious beliefs and practices, courts will continue to refine the application of the Religion Clauses to new situations.
The First Amendment’s protection of religious freedom remains a cornerstone of American liberty. By prohibiting both the establishment of religion and interference with its free exercise, the Constitution creates space for religious pluralism and individual conscience. Understanding these protections and their limits is essential for all Americans seeking to exercise their religious freedom while respecting the rights of others.
For more information about the First Amendment and religious freedom, visit the Constitution Annotated from the Library of Congress or the Freedom Forum, which provides extensive resources on First Amendment rights and their application in contemporary society.