Ex-Christian here, I was in a pretty easy going division of Christianity, main thing was that we didn't believe in hell and were "metaphysical" (hippie way of saying we didn't strictly adhere to the Bible). I would often look after the smaller kids in Sunday school, and one day we put on the veggie tales version of Noah's ark, and I actually watched it while watching the kids, and somewhat considered the idea that if there was a flood, inevitably quite a few children would have been caught up in it and died, which in my mind a kind god would not have even contemplated. The level of cognitive dissonance I experienced kind of made me think about listening to atheistic opinions to double check I wasn't completely off the mark with my beliefs. So I listened to Dawkins, Hitchens, and Carl Sagans arguments then actually sat down and read the Bible. Not gonna say I accepted it overnight, but that is what eventually led me to where I am today as an atheist.