I didn't like church as a kid, but I don't know if it scarred me. It was boring, and the kids that went were sometimes mean. However, kids at school were mean, too, so I didn't connect it at church. I think my greatest upset was that my dad wouldn't let us get doughnuts after Sunday school(he wanted to take off before anyone could rope him into going to the service).
I think Christianity somewhat bounced off me. I never internalized it. Jesus was great, died for us, yada yada. Sure. Do the wrong thing, burn in Hell. Got it. I did notice in general society, bullies often claimed Christianity, but I never reflected on it too deeply in childhood.
I think I had a more negative(but much briefer) experience with the UU church in adulthood. We attended for a few years, and while everyone was kind and pleasant to begin with, once we'd been going awhile, people there let their colors show.
We were quite poor by American standards, and I think a lot of people meant well, but they were always giving us food. It was embarrassing. Cooking was/is my main hobby, and when I'd talk about what I'd made that week, I'd get giggled at like I was lying. We were patronized frequently, with some just kind of poking fun snickering to each other, to being downright mean to my husband's face(I didn't have that trouble). I was always getting scolded at because my kid wasn't talking yet(he turned out to have apraxia of speech and autism). Everything was very catty and petty. My sense of self worth plummeted.
Honestly, it wasn't just us. Anyone who wasn't middle class, heterosexual, atheist, formally educated, and extremely liberal was kind of picked at. It was somewhat baffling, as these were some of the groups the church claimed to be working to help! There was an older gay couple we used to have snacks with after service that abruptly disappeared. We saw them soon after and asked where they'd been. Apparently, other men in the congregation had been openly cruel to them because they were gay, so they left. A shame, they said. They had been married in that church, but the congregation changed over time. There were other folks(all 'outsiders') we heard snippets from that had left, or were becoming sparse, and all were reporting similar experiences. We had an obligation to teach one of the youth classes there that year(the kids were great!) Once our time was up with that, we left.
This is the only UU church we had attended. I know this is not what they claim their values are, and I hope UU churches elsewhere are truer to what they teach.