Real simple: I started on a journey to find credible, testable, objective evidence that would support my religious beliefs.
I found none. I was forced to conclude my beliefs were not founded in any evidence. So what good is hanging on to them?
To be sure, I prayed a lot a put a simple test before God, much simpler than some of the tests faithful people mentioned in the Bible are said to have put before God.
God didn't respond in any way or form.
So, no evidence and no response. To me, that's clear enough.
Hadn't I been indoctrinated from birth I would never have come to believe in God based on the (lacking) evidence.