The most basic answer I can give (which seems silly compared to Min's responses lol) are that a lot of them thought that humans could best gods and replace them so I assume that yes they thought the gods were either invisible or shape shifters.
“What screws us up the most in life is the picture in our head of what it's supposed to be.”
Also if your signature makes my scrolling mess up "you're tacky and I hate you."
Also if your signature makes my scrolling mess up "you're tacky and I hate you."