[Larry Boy]

I essentially agree with the so called "physicalists" in this thread. Morality has nothing to do with metaphysics. I do think depression may lead to questionable behaviour though. I mean, we all know how it feels to be tired and how easy you can get upset when you are. But, a religious man can be as depressed as an atheist! Although I believe there's a high probability in the Afterlife, I sometimes get really depressed, and at such times I tend to think of people in ways that make me ashamed of myself.
To sum up, being happy makes it easier to be moral (or act that morality out), and while religion or spirituality may be a "shortcut" to happiness, it's certainly not a necessity.