A little thing called The separation of church and state.
With all due respect Senor Strings, that is nowhere in our Constitution or Bill of Rights. It was however in a letter written by Thomas Jefferson to a Baptist minister in 1803 but I can't figure out if he was just trying to garner votes from nonbaptists or ensuring the Baptist minister the govt wouldn't fuck with his church in an effort to garner votes from Baptists.
Funny how that works.