The First Amendment to the U.S. Constitution guarantees freedom of religion in the free exercise clause, and freedom from religion in the establishment clause.  Michael LeMay's book: Religious Freedom in America, 2018, ABC-CLIO, 350 pp. explores more than 200 years of U.S. history in how society grappled with those two concepts and how they influenced U.S. politics.  It details all the U.S. Supreme Court watershed cases that defined the meaning and boundaries of the religious freedom debate.