I'm not sure if Atheist is the right word for this. Yes, the people who started this and, indeed many of the members are atheist, but there are also students of divinity and every flavor of Buddhist. Atheist to me has always seemed to be overused because a lot of things are not "Anti-God" but more "Pro-Human" And I don't see why people who are for God could be against this kind of thing. As long as people are helping the poor, the needy, I think that persons motivation shouldn't matter all that much.