Atheists tend to ATTEMPT to re-write history and claim that all of our Founding Fathers were either Deists or Atheists, even though the Evidence does not support this theory.
Thomas Paine was the only outright atheist that I know of. The rest were mainly members of the Episcopal church which was/is hardly fundamentalist by today's terminology. Yes, there were Founding Fathers such as Benjamin Rush who could be classified as fundamentalist but the more prominent Founding Fathers just weren't all that religious although many did attend church services.