It seems to me that the generalized sense of dissatisfaction that some of you are feeling stems from the fact that atheism is not a proper worldview.
Which is not to say that it is wrong, or bad. It's just invalid in that context. it's like somebody asking what kind of car you drive and saying "I like bananas" well yes you very well might, and if so I'm happy for you, but there's still the problem of discerning what sort of car you drive.
Atheism doesn't do the same sort of things Christianity does, or that another religion would. it really doesn't do anything at all because it's not a thing. it's an un-thing. It just so happens that it often corresponds with some other things that begin to fill that void. Naturalism, Materialism, Capitalism, Humanism... even the militant side of the new atheist movement, helps to provide something to belong to, and to care about.
Now that you're an atheist, you've got to get yourself a worldview.