The principle of Separation of Church and State aims to maintain a clear distinction between religious institutions and government entities, ensuring religious freedom and preventing the dominance of one religion over others.

In Engel v. Vitale (1962), the U.S. Supreme Court ruled that a state-sponsored prayer in public schools violated the Establishment Clause of the First Amendment, thus establishing the principle of separation of church and state in education.

Accommodation is a legal doctrine that permits government entities to provide funding or benefits to religious institutions for secular purposes, as long as it does not endorse or promote a particular religion.

The International Covenant on Civil and Political Rights (ICCPR), adopted in 1976, includes Article 18, which guarantees the right to freedom of thought, conscience, and religion, including the freedom to manifest one's religion or belief in worship, observance, practice, and teaching.

Free Exercise is a legal principle that protects individuals' right to practice their religion freely, without government interference or coercion. It is often considered a fundamental right in democratic societies.

In Lemon v. Kurtzman (1971), the U.S. Supreme Court established the Lemon Test, which consists of three prongs: (1) the government action must have a secular purpose; (2) the primary effect of the action must not advance or inhibit religion; and (3) the action must not result in excessive entanglement between government and religion.

Religious Neutrality is a legal principle that requires the government to treat all religions equally, without favoring or discriminating against any particular religion. It is closely related to the principle of Separation of Church and State.

In Lynch v. Donnelly (1984), the U.S. Supreme Court ruled that a city's display of a crèche (nativity scene) in a public park during the Christmas season did not violate the Establishment Clause, as it was part of a secular display that included other holiday symbols.

Autonomy is a legal principle that recognizes the right of religious institutions to govern themselves and make internal decisions regarding their own practices, beliefs, and membership, without government interference.

In Hosanna-Tabor Evangelical Lutheran Church and School v. Equal Employment Opportunity Commission (2012), the U.S. Supreme Court ruled that religious institutions have the right to hire and fire their own employees, even if those employees are performing secular tasks, as long as the employment decision is made in accordance with the institution's religious beliefs.

Tax Exemption is a legal principle that allows religious institutions to be exempt from paying certain taxes, such as property taxes and income taxes, in recognition of their non-profit status and their contributions to society.

In Zelman v. Simmons-Harris (2002), the U.S. Supreme Court ruled that a state program that provided tuition vouchers to parents of children attending religious schools did not violate the Establishment Clause, as the program was neutral toward religion and the vouchers could be used at religious or secular schools.

The Religious Freedom Restoration Act (RFRA) is a U.S. federal law that allows religious institutions and individuals to object to certain laws or regulations that substantially burden their religious exercise, unless the government can demonstrate a compelling interest in enforcing the law and can show that the law is the least restrictive means of achieving that interest.

In Trinity Lutheran Church of Columbia, Inc. v. Comer (2017), the U.S. Supreme Court ruled that a state program that provided playground resurfacing grants to private schools, including religious schools, did not violate the Establishment Clause, as the program was neutral toward religion and the grants were awarded on a neutral basis.