While I have met people who have good ethics and morals, they are basically rooted in religious tenants; people did not just invent them as good behavior patterns. For instance, it is generally a good moral and ethical trait for a married man to be faithful to his wife; it is more fruitful and more healthy than the results or fruit of adultery. It is rooted in Judeo/Christian morals and ethics, but can be applied universally for sure. The same would hold true for killing your fellow man (Thou shalt not kill) or stealing someone's property (Thou shalt not steal). All these have their main roots in religion. You are correct, they went to great lengths to practice "Chrisitian tolerance" of other religions, and they sought to avoid the model of a government sponsored and imposed particular religion (or in their case, a denomination) i.e. The Anglican Church of England. However, most of the Founders were devout practicing Christians, and there is an overwhelming plethora of documentation on this. Very few were actually Diests, and some were even atheists.