Reality and fiction are two different concept.<quoted text>
Based on your assertion here, Harry Potter is real, so is Spiderman, Superman, and Wonder Woman. Your assertion also includes Cthulhu being real, as well as every other god ever written about. So why do you deny the existence of Zeus?
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.