It is hard to argue with the founders own words. For Pete's sake, the Declaration itself proclaims that it is God who has created all men equal. The men who signed it, and helped write it, most definitely believed that man's rights derived from God and that God wanted all men to live in liberty and happiness. The founders stated numerous times that without the moral foundation that is in the bible, a free nation cannot long be free. If you ignore their own words, which are available to all in many different documents, you just end up looking like an idiot, except maybe to those who don't bother to dig and read either, and only spout what some brainwashed professor or teacher says from their lying bully pulpit.