Was America founded as a Christian Nation? No.<quoted text>
So believed our Founding Fathers ... that our rights derive from God, not from government.
The founding faith was NOT Christianity; and it was not secularism. It was religious liberty including the right to be an atheist.
Listen to Terry Gross interview Steven Waldman. About 39 minutes.
Examining the Origins of America's "Founding Faith"
(Audio -- about 39 minutes)