If you knew the history of it, you would know that there is a Satanic component to Halloween. It was a night of revelry (which in Europe meant beer and bawds), before All Saints Day, a solemn feast day. I don't know the origins of the costumes and bugging the neighbors for candy. But you sure couldn't connect bats, spiders, ghosts, witches, vampires, skeletons, etc to anything having to do with our Lord. Which leaves only one other prime candidate, ye olde furnace room manager.