The Fourteenth Amendment, adopted in 1868, extended religious freedom by preventing states from enacting laws that would advance or inhibit any one religion.

Reynolds v. United States (1878): This Supreme Court case tested the limits of religious liberty by upholding a federal law banning polygamy. The Supreme Court ruled that the First Amendment forbids government from regulating belief but not from actions such as marriage.

Braunfeld v. Brown (1961): The Supreme Court upheld a Pennsylvania law requiring stores to close on Sundays, even though Orthodox Jews argued the law was unfair to them since their religion required them to close their stores on Saturdays as well.

Sherbert v. Verner (1963): The Supreme Court ruled that states could not require a person to abandon their religious beliefs in order to receive benefits. In this case, Adell Sherbert, a Seventh-day Adventist, worked in a textile mill. When her employer switched from a five-day to six-day workweek, she was fired for refusing to work on Saturdays. When she applied for unemployment compensation, a South Carolina court denied her claim.

Lemon v. Kurtzman (1971): This Supreme Court decision struck down a Pennsylvania law allowing the state to reimburse Catholic schools for the salaries of teachers who taught in those schools. This Supreme Court case established the “Lemon Test” for determining when a state or federal law violates the Establishment Clause—that’s the part of the First Amendment that prohibits the government from declaring or financially supporting a state religion.

Ten Commandments Cases (2005): In 2005, the Supreme Court came to seemingly contradictory decisions in two cases involving the display of the Ten Commandments on public property. In the first case, Van Orden v. Perry, the Supreme Court ruled that the display of a six-foot Ten Commandments monument at the Texas State Capital was constitutional. In McCreary County v. ACLU, the U.S. Supreme Court ruled that two large, framed copies of the Ten Commandments in Kentucky courthouses violated the First Amendment.