Fellow atheists, what was the turning point in your days as a god-believer?

When I told someone I was a christain which I was and believe with all my heart. Then someone said "that's impossible" to something I said was possible. When I said "yes it is. Jesus did it" I realized how big of an idiot I sounded like. Then I questioned my faith and realized nothing added up and Finally I realized i was worshipping something fake.