Here’s a thoughtful video about one person’s deconversion process: the interesting thing about it is that he was a believer who reasoned himself out of religion.
Although I was brought up in a religion, I’ve discovered that there is a large difference between those who were seriously immersed in a faith, like this fellow, and people who just got a fairly brief and not very deep exposure, like myself. I was rather easily disabused of religion — when I first was taught the tenets of the faith, my reaction was more like, “You believe what? And you expect me to believe it too? That’s batty!” I didn’t need the careful dissection of belief, because what jumped out to me was the raging absurdity of original sin, virgin births, gods manifesting as men, etc., etc., etc.