i was brought up by a religious family, my indoctrination started when I was very young. I remember learning about gensis at sunday school at about the same time I was learning how to tell the time.
At about 7 I began to question religion. The more I looked at it the more it looked like it was made up.
As I learned more about the universe, astrophysics, evolution etc there were so many holes in christianity that it became unfeasible to believe in it.
By the time I was confirmed at 15 I was pretty sure that christianity was nonsense. I was just going to church because my family expected me to.
I looked into other belief systems, the mythos of Carlos Castenada was a favourite at the time. I still like his books
In the end I asked a priest my questions and the answer that I got was (pretty much verbatim) "if there is no god and we live in a capricious universe then stop the ride I want to get off"
I was about 24 when I asked that.
that was the final straw.
I still go to religious buildings, but only to look at the architecture. I still read religious texts, but only to get an understanding of other cultures.
I'm happy living this way and I think it has made me a more rounded and tolerant person.