I really don't see how anybody can be an atheist. I totally understand why the Sky Daddy god can be rejected but, to say there is no intelligence behind the creation of our world just doesn't make sense to me. It's like looking at the blob of grey matter we call the brain and only seeing the tissue and the neurons firing. You can't see the consciousness, the thoughts themselves, the emotions, the creative ideas that ignite the brain, the experiences we call Life, or a million other things guiding and directing our choices everyday.
This is where faith comes in. You just know based on something so deep inside that you have full assurance in its reality.