[–] fuck_communism 0 points 1 point 1 point (+1|-0) ago
Do you have a source handy
No, and I'm too lazy to get one. Check the Oxford Encyclopedia of American Political and Legal History. It's concise yet reasonably thorough.
Congregationalists were warmed over Puritans
And Puritans were essentially Anglicans who thought The Church was still "too Catholic," they recognized Anglicanism as a "true religion" (unlike Catholicism), but felt it needed further reform.
a Puritan church was not going to be imposed on Southern states or New Yorkers and ditto for Anglicanism on New Englanders
True, but that was not the primary motive behind the Establishment Clause at the time of writing, it's worth noting that the last phrase in Article 6 is "no religious Test shall ever be required as a Qualification to any Office or public Trust under the United States," which, I think (opinion), alludes more to your point than to the future establishment clause.