Well I guess technically you could be Gay and Christian, if you were a person who is only attracted to the same sex and not the opposite one, but also realizes it is a sin to act on that attraction, so decide to live a celibate life. But somehow, I doubt that’s what this story is talking about...
"I'm completely normal, just like everyone else. Except that I engage in practices that are outside the norm, and go completely against everything that I claim to believe in."
I feel a little sorry for these people. Imagine the mental gymnastics that they need to engage in, just to get out of bed in the morning.
And, for what it's worth, I agree with you on your point. *Who* you're attracted to is one thing (I'm no expert, but I figure that it's a combination of learned behavior and/or a chemical imbalance of some sort). However, the *actual act* is nothing more than a simple behavior.