Also got a thought-provoking article from Alpha
Quentin Tarantino nailed it in a monologue by Bill in Kill Bill, where he says an essential characteristic of superhero mythology is that there must be a superhero, and an alter ego: Bruce Wayne puts on a suit to become Batman and Peter Parker does the same to become Spider-Man. But Superman was born Superman - his alter ego is Clark Kent.
"His outfit with the big red S, that's the blanket he was wrapped in as a baby when the Kents found him. Those are his clothes. What Kent wears - the glasses, the business suit - that's the costume. Clark Kent is how Superman views us. And what are the characteristics of Clark Kent? He's weak, he's unsure of himself … he's a coward. Clark Kent is Superman's critique on the whole human race."
Maybe this is what is most Christlike about him - not what it is to be heroic, but what it is to be human.
More Reflections on the movie:
Superman Or Perfect Man?
Jesus Christ Superman
What do Superman and Jesus have in common?
Christ Figure of American Pop Culture
Superman, Jesus Christ and Jim Caviezel