Nothing "turned" me away from God. I grew up in a small city in the South (U.S.) where religion was moderate (not the Deep South) but pervasive. My family and neighbors were religious but it wasn't a daily subject and no pressure was put on anyone (societal or otherwise) in this regard.
I just never believed. I had to go to Sunday School though about age 15. There was no turning away. I never was religious. I never did believe in God unless you count as a very young child where I also believed in Santa, Aladdin and his flying carpet, etc.
I think, for some reason, this surprises some who are religious and they just assume that everyone starts out religious. If you don't grew up in a religious family and in a religious area, you likely aren't religious.
If you do grow up like that but no pressure is put on you to "believe" and if you are intelligent, educated, etc. you very likely never did believe.
That's not to say that you can't be educated, intelligent and believe but it especially doesn't usually happen that way if you don't grow up with religious influences.
When I was 13, there was a class for "confirmation". I said I wasn't interested. My mom said that she thought I might want to go to be with my "class". I said, OK, I'll go check it out. I went to the first session, it seemed like a cult, we had to repeat allegiance to God, praise God, etc. and that wasn't for me.
When I got home I said that I wouldn't be going back. My mom said, this isn't the kind of thing that should be forced I suppose and I didn't go back. I still had to go to Sunday School for another couple of years.
Sunday School was barely religious. It was just an adult talking to "young adults" about how school was going, did we treat new students from out of town well, no bullying, why that was wrong, etc. When I went to the confirmation training those same adults were involved but now instead of acting "normally" they are all stressing obeisance and praise to God. As I said, it was too cult-like for me. I think this might have been the first time that I realized that they really believe in this non-sense.
In a small city, many adults have to at least pay lip service to religion since it is the local culture. If they sell real estate, appliances, cars, or insurance they have to be somewhat religious in name at least. Even in my case, I didn't use the word "atheist". If someone were to ask me if I was religious (and it was rare that anyone would do that) I would just say "no".