He's flooded the world, destroyed Sodom, and sent many prophets to remind us of this fact. The point is God abhors all sin and tells us to get rid of it. It's not a question that this must be done in a spirit of love and humility. However, as strange as it might sound to our desensitized North American ears, Christians are sometimes sanctioned by God to be offensive in order to uphold his truth. Well, for starters, lets stop pretending that there is some kind of hierarchy to sin.
Sin is sin.
A couple engaged in premarital sex, an individual cheating on their spouse, and a person participating in homosexual behavior are all guilty of sin in God's eyes. Recognizing this fact is the first step to any kind of healing. We have to repent before we can be forgiven. Exposing our sins together will then allow us to unite and confront them together. In order to do it, it seems necessary that there be a distinction between orientation and behavior.