Explanation: For all the many flaws of the 'big 7' Founding Fathers, 6/7 of them were firmly secularist. 2 were not Christians in the modern sense (Jefferson, Franklin), two may not have been Christians (Washington, Madison), two were secular Christians (Hamilton, Adams), and only one advocated for involvement of the Christian faith in public affairs (John Jay).
In fact, for several generations after the American Revolution, Christian fundamentalists in the USA regularly condemned the foundation of the country by 'heathens' as wicked, and the USA itself as an aberration.
It would seem once they saw an opportunity to worm their way into power, they reversed their opinion on the American polity.
Nowadays, church and state remain formally separate in the USA, but in practice, there is a rapidly eroding barrier between the two due to the support of a majority of voting Americans for conservative and fascist shitheads.


