Vampires existed long before the church. They just have a brain disorder that gives them a seizure when they see straight right angles. Right angles don’t really exist in nature. Humans found out this and started making crosses. Humans created the church to maintain this knowledge during the vampires long hibernation periods of around 1000 years. (Credit to author Peter Watts “Blindside”)

There was a vampire movie, I forget what it's called, but part of the lore was that vampires were only affected by religious symbols from their original society. So showing a cross to a Muslim vampire wouldn't work.

This why I like the origin of vampires being Judas’ failed suicide attempt. Explains the silver allergy, too.

Sorry to fact-check a pretty good shitpost, but I don't think lowercase t existed until later