You can argue that what he does is humane even that it is more humane that any other actual human on the planet but I'm sorry you cannot justify Superman as an actual Earth born human. His genetic material and his powers DO define him because without those he wouldn't be able to accomplish these massive feats of humanity in which you are trying to glorify.
The character IS Kal-El. He wants desperately TO BE Clark Kent, so he can fit in, have a home, a species but in order to try and save the home he loves so much he BECOMES Superman. You can't argue that the character as defined by the creators of said character, what part of that do you not understand?
You are seriously bridging trolling status at this point...
I'm not trolling at all. But maybe you are?
In both Byrne's "Man of Steel" and Ross' and Waid's "Kingdom Come" the point was made clearly that it was Clark Kent's humanity that made Superman the greatest superhero.
Byrne went so far to make the point that he was actually born on Earth since he didn't emerge from his birthing matrix until he had landed on Earth. Unfortunately, Byrne made Kryptonian's look exactly like humans. It would have been more "realistic" to make them look completely inhuman, perhaps not even show them or make them formless, and have the birthing matrix scan the DNA of the Kents and use that to "make" Clark into a super human.
Even still, in Byrne's origin, logically, Clark's earliest memories are of being raised by the Kents, he never knew the El's until much, much later and at a point in time well after his personality and self identity had already been established as Clark Kent and a human being. Later when he put on the suit that Ma Kent had made for him (with an S-shield that had an S on it that Ma Kent had designed and stood for Superman) he became Superman. In order to keep his real identity secret, to the world Clark Kent became a "nerdier" version of the Clark Kent that Ma and Pa Kent raised and only those closest to him knew the real Clark Kent (something that's not uncommon in the real world where only the people closest to you know the "real" you). In that regards, Clark is not really Kal-El at all.
While physiologically Clark is an Kryptonian, psychologically he is a human.
Of course that's all post-Crisis and pre-DCnU, so it's out the window in terms of current comics continuity, but in my opinion that was the best interpretation of Superman I've read.
A close second was Mark Millar's Superman from "Red Son" who was really a human sent back in time and Jor-L is actually a distant descendant of Luthor (the L is for Luthor).