Well, I suppose it depends on who's writing the story. I don't think they mentioned DNA in the early years of Spider-man.
There was even a period of time when Marvel proudly proclaimed on the cover of every Spider-man, "The non-mutant super hero!"
Ultimatly, I'm just having fun here. None of these characters are affected by the sun, or by radiation, or by genetics, or even by magic. These characters are fiction! They exist only as drawings and stories.
That's why I can't see them as non-Christian. I don't recall a single word in the Bible saying you can't read about fictional characters who do this or that.
Arguably, a statue of George Washington may be less Christian than Harry Potter or Superman. I recall a passage in the Bible that says not to create an image of anything on the Earth or under the Earth, but nothing about creating images of things that have never existed. Harry Potter and Superman never existed, so they fall in that catagory.
Charlie
PS. Okay, so I'm a wacky comic book purist. But I'll point it out anyway.
As a matter of convention, Spider-man is spelled with hyphen, Superman is spelled without a hyphen, and Batman is the same. Unless you're talking about the very early Batman from 1939, in which case he's The Bat Man.