This family pissed me off so much because they let their kids do other stuff
When I was a young lad, I had a good friend (who later turned out not to be a good friend, but that's another story) who I spent most of my time with. We read comic books, played with Star Wars and G.I Joe figures, wrote short stories, recorded our own radio programs, and every year, went trick or treating. Then, suddenly, his parents became born again, and suddenly Halloween was evil. When we got to put on our costumes at school and do the costume parade (K-12th was all in one building - small town - so the kids would walk through the older kids' classes and show off their costumes), he and his sister would dress like someone from the Bible. There were only two years left of this, so one year he was a shepherd, and the other I think he was Moses. He and I would suddenly have terrible arguments because he was being swayed by his parent on topics that we had once seen eye to eye on.
I did work with a guy who was very religious, and he used to question my love of Harry Potter. He bought into all of the Xtian hype, believing that there were real curses and spells being taught to kids, and that they would turn kids away from Christ and into witchcraft or satanism.