Church was absolutely dreadful for me, too. I don't know what it was, I think that ADHD played a factor - as being asked to sit still and listen to a sermon was the worst thing for childhood me. I just wanted to go home and do things that stimulated me. I remember drawing on the church program sheets. It was the only thing I could do to keep sane, and even still it wasn't enough.
Be it a result of neurodivergence or otherwise, I'm very happy that I never got attached to church or church life/community. That made when I stopped believing so much easier. My parents stopped attending church in my mid to late teens and stopped making me go as well. No tears were shed.
As for autism - well, I haven't been screened yet, so I can't say for sure whether I'm autistic or not. I do know one thing and that's that a "strong sense of justice" is often listed as a symptom of autism, and I do feel like that describes me very well. I formed a strong sense of morality early on and that did not seem to come from religion much if at all. That "strong sense of justice" would eventually clash with my religious beliefs, which caused a huge reckoning for me.
My deconstruction was complicated, there were many factors, but the clash with my morality was a huge factor that unraveled my belief. For as long as I can remember, I see treating each human as a human being as a pinnacle of what is moral. Now the churches I was raised in were pretty tame, and my parents are liberal, so I didn't get exposed to more conservative forms until I began to grow up, go to school, become politically aware, etc. I will abstain from going too much into the politics, but know that it plays a role here, too.
A huge part of this all was that I became more knowledgeable on the Bible (young Christian me was, as you might expect from the beginning of this post, pretty ignorant. Paying attention in church was extremely hard for me, so I only go the rosy pictures of the stories). When I learned what the Bible said about women, gay people, slavery, etc. it was irreconcilable with my morality.
The irreconcilability with my strong morality was a key factor in the loss of my belief, as once I was at major odds with the Bible on that, I was able to take a step back and realize that I never had a reason to believe in the religion or deity to begin with.
So... If it turns out that my "strong sense of justice" trait is autism-related, then it could be said that it played a huge role in my deconstruction. One of which I'm grateful for. Still, as I have not been screened for, much less confirmed, autistic, I have to take this thought with a grain of salt. It could be related to autism, or it could not be. Someday I hope to find out so. When I feel safe enough to get screened.