That's not a very strong argument. Surely some of the founders were religious, but many others, Franklin, Jefferson, certainly Thomas Paine were not. Figues like Franklin and Jefferson were strongly influenced, as were western European intellectuals, in those times, by the European enlightenment, which was more science based than religious based. Many intellectuals of the 18th century, both in Europe and America were deists, not theists. At that time deism was a sort of socially acceptable atheism. The strong American religious sentiment you refer to, I believe, comes more from the subsequent "Great Awakenings" and tent revivals that were imported from England to counter the Anglican hegemony in the American church of those times. That's where the Evangelical sects arose from, from the later great awakenings, not from the enightenment based deism of the founding fathers.
