Nine colonies developed state churches, which were supported financially by the colonial governments and whose power was woven in with that of the governments. Other Christians — Lutherans, Baptists, Quakers — and, of course, those of other faiths were made unwelcome, if not persecuted outright.
There was a religious element to the American Revolution, which was so pronounced that you could just as well view the event in religious as in political terms. Many of the founders, especially the Southerners, were rebelling simultaneously against state-church oppression and English rule.
Russell Shorto writing on the Christianity of the Founders, and the battle for history in Texas’ State Board of Education.