Which clause prohibits Congress from establishing an official state religion?

• A. Free exercise clause
• B. Exclusionary rule
• C. Establishment clause
• D. Due process clause

Answer: (C)

The Establishment Clause of the First Amendment is about keeping government from creating or endorsing an official state religion. It says Congress shall make no law respecting an establishment of religion, which is why this clause directly prohibits an official church or government preference for one faith. That makes it the best answer. The other clauses cover different protections: the Free Exercise Clause protects individuals’ right to practice religion freely; the Due Process Clause ensures fair treatment under the law; and the Exclusionary Rule bars use of evidence obtained in violation of rights. While the Establishment Clause originally limited the federal government, it has been applied to the states as well, reinforcing the separation of church and state across government levels.