[charlesism]

    Nearly all founding fathers were ... were also deeply religious

I'm no expert but I had the impression the founders weren't big on religion. One wouldn't admit to being an atheist back then, so being into Freemasonry or Deism was as close as you'd expect a public figure to get.

[harimau777]

My understanding (and I am not a historian) is that many of the founding fathers were not Christians (e.g. they were deists, agnostic, or atheists); however, they did come from a Christian culture and espoused/endorsed Christian ethical principles. There also were founding fathers who were Christians (e.g. Sam Adams, Washington, and Patrick Henry).

My interpretation of this is that America was founded based on Christian ethics, culture, and philosophy; even if many of the founders were not practicing Christians. In my opinion, this does not necessarily imply that America is/should be a Christian nation in the right wing/culture war sense.

[Kye]

They assembled a country from components of a lot of cultures through history. They were as informed by the source of Christian ethics (older religions and philosophies with the same ideas) as by Christianity itself.