The founding fathers were remarkably secular for their time. In 1776 religion was a lot more popular than it is today.<quoted text>
The philosophy of America's founding is a religious concept - that is the only basis they could find for affirming man's endowment of rights, and the inheritance of those rights in equal fashion.
The unique thing about the foundation of America was that between 9 and 13 of the signers of the constitution were freemasons. This includes the main figures such as George Washington and Benjamin Franklin. America is a masonic nation with Washington DC as a masonic capital.