You see, being a homosexual is not a sin. Committing homosexual acts is. Desiring sex is not wrong. Having sex with someone who is not your spouse is.

If you say that, and you also believe that gays should not be allowed to be married, it sounds like what you're saying is that you want to deny people the opportunity to not sin (or, at the very least, to decrease the amount of sinning that they do). That doesn't seem to be a very Christian attitude.