There is a danger in discussing religion from a rational perspective. The idea of religion, of an invisible, intangible being or beings that influence/control/inhabit our world, or rather the idea of believing in this being/these beings is inherently irrational. No matter how a person of faith seeks to use rational arguments to persuade or explain his world view, in the end there is always an unprovable premise, that God (the gods) exist.
I say this as a person of faith. I cannot prove that what I have experienced is what I think it is. There are experiences I've had that I am unable to communicate to anyone who is not me and was not there. To acknowledge this is to abandon any sense of universal experience or rightness; what works for me is unique and would work less well for any other individual.
All this being said, I have come to the conclusion that reason, or rational thinking has been artificially elevated to a place of dominance that ill serves us. Like any other tool, it has its place. In certain settings, such as scientific inquiry it is uniquely fitted to the tasks it is used for. But to seek to apply logic to situations where logic isn't the right tool does a disservice to everyone involved. It is the flaw, the difference between talking about religion and living a religious life. It's rather like sex, until you've had a lot of it, you really can't fathom what it's like, and it doesn't matter how many books you've read with that quaint "explicit descriptions of sex" tag appended to the annotation. Same same with violence. Same same with religion. There are things that have to be personally experienced to be understood.
Now where does all this connect to the previous discussion? On the matter of Free Will, I choose, (with no objective proof possible) to act as though I have free will, that is, that I am the agent of my own fate. I also hold the paradoxical view that I am not the sole agent of my fate, that my fate is wound round that of everyone with whom I come in contact, and that their choices affect me in ways over which I have no control. So, I believe in gods. I do not serve gods, except insofar as one serves partners in a relationship of equals. What they "do" affects me in the choices with which I am presented, but does not force me to choose. Remember the Irish hunger strikers? (If not, there's an excellent book called Biting at the Grave which tells their story.) Bobby Sands indeed willed himself to starve to death in service of his cause. I assume he made a cost calculation and decided that the continuance of his life was worth less by the inherently irrational criteria he weighed such things on than the impact of his death as protest. Whether you or I might disagree with his judgment doesn't change the fact of his exercise of free will within the limits created by the choices of others, of the British government to perpetuate its rule over Northern Ireland, of his jailers to attempt to enforce the breaking of the wills of IRA prisoners, of his own compatriots, who viewed the hunger strike as an ancient and honorable form of protest.
It is important to note that the atheist who attempts to justify his unbelief by stating the absence of proof is also engaging in the end in non-rational thinking, since absence of evidence does not imply evidence of absence. In saying this, I am not seeking to change his mind; his unbelief does not harm me, as my belief does not harm him, unless either of us seeks to change the external world to validate our beliefs. As a member of a minority religion that is viewed with suspicion at best by many members of the Christian overculture, I live with the realities of these impositions every day. It's something the atheist and I have in common.
A note on history, one should be careful ascribing a deep Christianity to the founders. There was an excellent piece in. . . was it Salon or Mother Jones, reminding us that Washington, Adams, Jefferson, Madison and Paine would have been politically unelectable in today's world of mouthed faith. Each of them made statements to counter the mythology that has been built around them concerning their religiosity. The famous Washington, Valley Forge praying in the snow incident, never happened apparently. This country is a Christian nation because of a consciously planned political effort by Christians from the Puritans to Pat Robertson to make it so, to make our country the "City on the Hill." Many of the excesses of today's government come out of this fundamental subversion of the Founders' model, from Dominionist foreign policy to the simple inability to agree that contraception should be universally available and free as a public good, to the systematic denigration of women. We preach tolerance but only in the abstract. And anyway, there's a world of difference between tolerance and acceptance. I often wonder what Jesus actually thought about the issue of many paths, one mountain, whether the insistence upon One True Way is his or an artifact of the early church seeking to establish its power in a formerly hostile world.