*For Former Believers* - Why the Jump to Atheism?

A Jew of 32 years who is starting to reject religion, at your service! I won't go into the reasons why I am feeling this way, but let's just say that these feelings are not new.

What can ya'll tell me about going from belief to Atheism? When did you know it was something you wanted? Was it a gradual process, or were you just one-day like, "I don't believe in God"? To be honest, I am stoned and literally just thought about how the "God" is a bit strange...Anyway, any advice would be great.