Athiests who were raised as theists: For those who had a single Eureka moment when it all slotted together?

It was a gradual process over several years, but in the end I did have a "there's absolutely no freakin' way" moment. Sadly at the same time I also had another realization, that being "even IF I'm wrong, I still want nothing to do with him, ever". It was a very scared/sad/angry/betrayed moment. Yet at the same time, ginormous relief.