let's see, celestial father sends his only son to earth to be raised by his earthly mother because humans have a great potential for good, but they need guidance, they need to be shown the light.

i just described Mythra, jesus, hercules, zeus, thor, tons of gods in the hindi, egypthian, mesopotamian, babylonian, greek and some of the mayan pantheon and to some extent the golem and some other saviors. superman is just the newest of the great gods, one day, people will unearth our culture and believe that we idolized superman as a god.