Plus, in-universe he isn't a mythical figure, but a simple kryptonian under a yellow sun. He's an alien sure, but he's an humanoid nonetheless, born from parents, evolution and the like. Meanwhile, entities like Zeus, Darkseid, Cernunnos, etc. are mythical beings, and even the Amazons are not just women who ended on an island but something more than just humans*, at least in a lot of depictions I know off.
*or perhaps more accurately they came to be in ways which weren't necessarily human ?