What are the top 3 motivations for becoming an Atheist?

I want to hear from Atheists, Christians, Muslims...whomever feels that they can contribute some insight. No need to be insulting. Actually think of three intelligent reasons for becoming an atheist. For instance, grouping Jesus with the Easter Bunny and Santa Claus does not count as an intelligent answer and only shows your intolerance for someone else's belief system. This actually takes validity away from your argument. Be honest and mindful in your response. I'm really curious about this.