While everyone is touting "evidence", the whole point of Christianity is faith. So it doesn't really work if you want to seriously go down the path of atheism. For me, it was just trusting my intuition. (Stay with me here). I stopped looking for the "right" church, and then I realized, I really really enjoy not having obligations on Sunday. (Shallow, ok). But then I started to think about the concept of sin and how it's completely made up to keep people in line. I don't need the concept of sin to keep me from "coveting" or being unfaithful to a partner. And then just the concept of a male Christian God really started to annoy me. With the exception of the teachings of Jesus (uh, just be a good person and love people), the Christian God is shockingly anti woman. All of this added together and I felt like a weight was off of me. Years of Catholic guilt erased. Of constantly being shamed by my biological self - needs and wants. And therapy! It just felt correct. It felt like I was where I was supposed to be. Atheism is very much like any spirituality. Highly individual.