Take time to check out the debate between Christian philosopher William Lane Craig and atheist Sam Harris. The debate is centered on whether or not an atheist has a reasonable foundation for morality.
One is almost embarrassed for Sam Harris. Dr. Craig dismantles him. Harris provides no support for his contention that morality makes sense in a universe without God. All he can do is attack Christianity. It is the same error that Christopher Hitchens and Richard Dawkins make. It's just that Dawkins and Hitchens sound more eloquent.