[Serious] For former Christians only, why did you leave your faith?

[emjay]

Cognitive dissonance. I wish I could say, like so many here, that I reasoned my way out of it or critically thought my way out of it, but no, it wasn't like that at all, I wasn't even looking for an out, just a light bulb moment 'there is no God' came to me completely out of the blue one day when I was 18 and everything changed after that, as well as everything finally clicking and making sense (I mean as opposed to my fundamentalist/creationist beliefs before that).