A question I hear from time to time is "so what were your reasons for becoming an atheist?"
I don't like this question because I've been an atheist for seven years and have learned a lot over the years. Quite simply, my reasons for being an atheist now are in some ways different than the reasons I had for becoming an atheist in the first place. The question I'd rather answer--certainly the more relevant one--is why I am an atheist now.
Another question is this: "So what was the major turning point for you? Was there an incident or defining moment for you that really changed your mind?"
No! My path to atheism was a long and complex one with many minor turning points along the way. Trying to narrow it down to one moment is impossible. Furthermore, when this question is asked, it's often times the intention of the questioner to nail down your main contention with theism so they can defeat it and convert you back. Thanks for acting interested, but you're barking up the wrong tree!