Believing with you that religion is a matter which lies solely
between man and his God, that he owes account to none other for his faith
or his worship, that the legitimate powers of government reach actions
only, and not opinions, I contemplate with sovereign reverence that act of
the whole American people which declared that their legislature should
‘make no law respecting an establishment of religion, or prohibiting the
free exercise thereof,’ thus building a wall of separation between Church
and State.
- Thomas Jefferson on the separation of church and state.
Also, this site features a comprehensive list of quotes that the Founding Fathers made on the separation of church and state, Christianity and religion in general. I like to imagine that the Republicans’ heads would explode if they read only an eighth of these.