A Secular Nation

Must read:
America's True History of Religious Tolerance | History & Archaeology | Smithsonian Magazine

This passage—along with the facts that the Constitution does not mention God or a deity (except for a pro forma “year of our Lord” date) and that its very first amendment forbids Congress from making laws that would infringe of the free exercise of religion—attests to the founders’ resolve that America be a secular republic. The men who fought the Revolution may have thanked Providence and attended church regularly—or not. But they also fought a war against a country in which the head of state was the head of the church. Knowing well the history of religious warfare that led to America’s settlement, they clearly understood both the dangers of that system and of sectarian conflict.