We had mandatory "Christian" laws -- ones based on the Bible for most of the nation's history and that is what made this a great nation:
"Christianity is part of the common law"
[Sources: James Wilson, Course of Lectures [vol 3, p.122]; and quoted in Updegraph v. The Commonwealth, 11 Serg, & R. 393, 403 (1824).
"I verily believe Christianity necessary to the support of civil society. One of the beautiful boasts of our municipal jurisprudence is that Christianity is a part of the Common Law. . . There never has been a period in which the Common Law did not recognize Christianity as lying its foundations."
[Joseph Story, Commentaries on the Constitution of the United States p. 593]
Until now.