Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof. …

— U.S. Constitution, First Amendment

The Religious Liberty clauses of the First Amendment to the Constitution are a momentous decision, the most important political decision for religious liberty and public justice in history. Two hundred years after their enactment they stand out boldly in a century made dark by state repression and sectarian conflict. Yet the ignorance and contention now surrounding the clauses are a reminder that their advocacy and defense is a task for each succeeding generation.