It's an interesting piece of American history worth drilling down on.

The Virginia Statue of Religious Freedom originated from one of the Southern colonies, which tended towards more English mainstream religion (Jefferson himself was raised in the Church of England, but considered himself a Deist). It served as a sort of "non-aggression pact" between the religions, since the various sects of the Northern colonies had quite a bit of political power by virtue of concentration of their adherents and isolation from traditional European religious power.