Ah, but you see, if this theory were right, then the US government would in effect be pushing a certain religion as a state religion and banning competing relig

Ah, but you see, if this theory were right, then the US government would in effect be pushing a certain religion as a state religion and banning competing religions. And that certainly can't be right, because look, no one is even filing 1A lawsuits on this theory. So your theory must be wrong, QED.