Again, that just not true. Our founding fathers were profoundly impacted by the Great Philosophes of their age which included both Franklin and Jefferson. Faith had little to do with their work and Reason and Critical thinking had everything to do with it. There is a reason why that period in history is called "The Age of Reason".
The founding fathers made it perfectly clear that though faith and religion are all well and fine and important to society but Public Policy is far to important to be based on anything but reason, rational though and critical thinking.
No, it is not wrong. Religion is a philosopical endeavor! These men at the Constitutional Convention certainly did not divorce themselves from their guiding philosophical principles! No one ever does, not me not you. It is silly to think men deliberated for weeks over the radification of a constitution in some sort of mental vacumme. I know that there were also "other" philosophical ideas in play, but your suggestion that the key guiding one was not religious piety and faith is absurd!
It is a determined and ridiculous desire to void our nations history of who exactly were those first immigrants and the brave men and women that followed. The faith and commitment of those who eventually created our founding documents!