Found this quote recently by Kenan Malik, Neurobiologist:
Invoking God at best highlights what we cannot yet explain about the physical universe, and at worst exploits that ignorance to mystify. Moral values do not come prepackaged from God, but have to be worked out by human beings through a combination of empathy, reasoning and dialogue.
This is true of believers, too: they, after all, have to decide for themselves which values in their holy books they accept and which ones they reject. And it is not God that gives meaning to our lives, but our relationships with fellow human beings and the goals and obligations that derive from them. God is at best redundant, at worst an obstruction. Why do I need him?
I have yet to read it but am looking forward to Sam Harris' latest book The Moral Landscape...coming out in paperback soon. Harris contends that the only moral framework worth talking about is one where "morally good" things pertain to increases in the "well-being of conscious creatures".