[Vexx]

I'd just add this to Clarste's note:
Evolution seems to drive the idea that for social animals, "win-win" is better served by cooperation rather than selfish actions, hence the natural tendency to share resources once a critter has been socialized. Selfishness still cuts in of course, but the group tends to naturally discourage such behavior (at least publicly). That is the behavior seen in all social animals. That's speculated to be the underlying basis for the moral - "treat other people the way you want to be treated" that every sustainable religion in the world has as a core belief.

And yes, the surest path to political death in the USA is to admit being an agnostic or atheist. The average voter doesn't necessarily care WHICH you are (though Muslim seems to scare a few, we do have a Muslim or two in Congress) -- you can be Hindu, Buddhist, Mormon, Catholic, etc ... what seems to scare them is the notion that someone has an ethical system that doesn't derive from "a higher source". Interestingly, USA is about the only industrialized nation in the world where many of the voters place that check on any priority list at all, outside of those countries where people actually shoot each other or form political parties based on their religious quirks.