I was young and it was my first brush with a moral panic. Changed my perspective. Made me realize that it's not Evil per se that you need to watch out for, but simply regular people who are afraid of something.
I guess fire is the only way to get the demons out. Makes you wonder how they thrive in hell.
This bit of Christian mythology does make sense, I find. Actually, a fair few do, it's just that, well, angels and demons, right?
Oh and now that I mentioned it, there's an RPG where you play devils or angels duking it out in the land of the living:
https://en.wikipedia.org/wiki/In_Nomine_%28role-playing_game...
... and I even have a hard copy, that I picked up from Oxfam. Hmmm...
If my Dad had burned ANY of my books that would have probably also burned any relationship. I can only guess at the sense of betrayal, and that's one of those run away and join the circus type events or go to a far way college / join the military life choices.
Did you friend benefit from this experience? In fairness it could have freed up time for team sports or community service.