If you wish to credit Christians as the founders you are citing anti Catholic Protestants. PRIOR to the beginnings of the revolutionary period Catholics (Papists) where the scourge of the earth to the Protestant population of settlers.
The victory in war and the creation of the Constitution written by students of the non Christian EUROPEAN enlightenment allowed Papists to eventually achieve equal status with WASP run America.
Possibly some anti-catholic amongst them. But ALL agreed to the better solution of establishing religious liberty rather than put THEIR biases into any documents. Their ancestors came from Christian sects that largely DONT EXIST anymore because they were fully persecuted in the homelands.