It is not abnormal inasmuch as we are all drawn to sin; however, same sex attraction is a disordered passion that is a result of the Fall, and therefore must be worked against. That's it. As for your comparison to heterosexual identity, heterosexual attraction is not disordered, though acting on it can be, therein lies the difference. If someone based their identity on how many women they could pick up, I would find that sad, as well, because much of that person's identity would be based upon a sinful inclination. Again, through our union with Christ we can escape the corruption that is in the world. That is the very root of the Gospel message; sanctification and union with God where there once was separation.
This is not theologically correct and here's why I think that...
The passions, technically are emotions. Passions is another name for our emotions, and the fall made our emotions out of balance.
being heterosexual or homosexual is more then an emotion that is out of balance.
Is it a disorder, like a birth defect? who knows, we certainly do not but to say its an emotion is seriously not understanding this.
It more then an emotion like lust is, in that if they try real hard with God's help and the Church and Communion, they can resist the temptation to like other men.
It just doesn't work that way.
A married man being tempted to look at other attractive women is a temptation he must resist and be on guard always.
But him being heterosexual that causes him to be attracted to women in the first place is not a temptation, its just who he is. Its totally normal.
A gay man looking at another man who he finds attractive... what would you say that is? In his world, its totally normal.
What his temptation would be is not acting on it and where the break down comes in with us is, if the married man where single and he meet a woman he found attractive, he could act on it... meaning, he can meet the women and get to know her.
A gay guy, he can't even do that because, why? why would he even bother when it can't go any further then "hello"?
So that's their struggle. It's so much more then just an emotion that is out of whack.