Lets leave the name 'Kal-El' out of this for now, otherwise it gets confusing:
Essentially there are three sides to this character (and Singer explained this on "Look Up In The Sky");
-
Clark On the Farm (The real man who grew up in Kansas under a human alias)
-
Superman (Clark's public superhero identity, known as an alien who became Metropolis' savior; an exaggerated public persona).
-
Metropolis Clark Kent (An invented personality that Clark uses to throw Lois, Jimmy, Perry etc off from discovering hes Superman in metropolis).
This works out beautifully because Clark's Superman personality tends to sometimes come out of Metropolis Clark Kent too; especially in front of Jimmy (who doesnt know Superman closely).
Lois knows Superman intimately but doesnt know barely anything about Metropolis Clark, he doesnt stand out to her.
Lex knows Superman intimately but has never even met Clark Kent (in both forms).
So this 3-way method of dealing with his identity works out believeably in this context.
What Singer needs to do for the future films is to throw more of a central focus to the real Clark. Hes essentially the guy who
plays the two exaggerations of Metopolis Clark and Superman.
I dont consider Superman to be the real person becuase in the deleted Smallville scenes there seemed to be some debate with farmboy Clark as to whether he should even go back to Metropolis and be 'Superman' or stay on the farm.
Clearly 'Superman' is something he does, Kansas Clark is who he is. The greatest irony of all this is neither Lois, Jason, Jimmy, Perry or Richard know his true personality. Thats one of the more interesting facets of the character.