Mine isn't bad as most of those here, and reading others makes me feel quite lucky. But for me:

Being told that some people will go to hell for eternity and some will go to heaven. And don't sin too much or you will go to hell.

I hated myself for any sexual urges or thoughts all the way through puberty. Caused me mental health issues and a dysfunctional view of sex. Also caused a great deal of stress. I didn't get to have a carefree childhood because I was so worried about going to heaven/hell and also where others would go. It is a very grim thing to put on a kid.

Also, my parents were emotionally abusive, even if they don't mean to be. I was not allowed to have any independent thoughts, only bow to their authority, and if I didn't do this they would lose their shit. They frequently gaslighted the shit out of me. My parents are the reason I have social anxiety.

Also, my parents were so hypocritical in their views, but of course I wasn't allowed to say or question anything. I remember my mom telling me minimum wage employees don't deserve to afford to live.