Richard Dawkins makes a couple of good points in a recent talk. 1) If God exists, he has to manage a universe filled with billions of galaxies, each with billions of stars, and we're located on the outskirts in an ordinary solar system in an ordinary galaxy, only one species of potentially billions upon billions. Why does he care about sin and or our morality? That and 2) Using supernatural explanations for phenomenon is a way to chicken out, so you don't have to do real work to find out the real answer to said phenomenon.