It's funny when people say that the founding fathers were religious because they put God everywhere in their documents. While that is true, not many people know that during the 18th century, most, if not all, intellectuals did not consider themselves Christians at all, but rather 'deists', meaning that they believed in a greater spiritual being called God who set the creation of the universe in motion and then sat back and watched events unfold. The simile they themselves liked to use was that of God as a great clockmaker, who makes a beautiful and complicated clock which can sustain itself for eternity.

It's not the founding fathers who were ultra-Christians, it's the puritains.