Harry Potter: 10 Ways The Muggle World Would Inevitably Discover Wizards
3. Religion
There seems to be some secular observance of religious holidays in the wizarding world, with Hogwarts students being given time off to go home at Christmas if they desire; or given a weeks respite from classes during the Easter break. But in a world filled with ghosts, poltergeists, and ethereal visits by those who have gone on, there is no mention of organized religion. (Thats one of the points that religious detractors of the series hammer on, but thats a debate well leave to them). We noted above that Muggles wouldnt take too well to the idea that there were other sentient creatures in the world. But give them the proof that ghosts exist, and that wizards have the choice to either become one or go on, and the holy wars will begin. The existence of such things is anathema to their belief systems, and they wont take kindly to having those proven incorrect. If their religion does allow for ghosts and an afterlife, its almost certain it wont match the wizarding worlds version.