At Drunken Blogging, Jonz has assembled a list of quotes about religion, including some from the Founding Fathers of the USA:
Abraham Lincoln, American president (1809-1865).
I have found Christian dogma unintelligible. Early in life, I absenteed myself from Christian assemblies... Lighthouses are more helpful then churches
Benjamin Franklin, American Founding Father, author, and inventor
At present there is not a single credible established religion in the world.