Harry Potter and all comic books contain real places, people, and things. Their content is about the same percentage of confirmed people, places, and things as your bible, many of them contain more than your bible has.<quoted text> Reality and fiction are two different concept.
Harry Porter is a fictional book and a comic unlike the bible, archaeology has confirmed many biblical places people thought, never existed unlike Harry Porter. Zeus is a Greek or Roman deity or god.
Why do you deny the existence of Zeus? If he winds up being the one true god, you're in trouble. Or Cthulhu, or Ra, or Anpu, or Bastet, or Thor .... you've pissed off a lot of gods.