My feeling is that God gave us free will. That means we ought to be free to choose whatever hell we want.
I also believe that God cares far less about what we do with our dangly bits (or don't do with them) than we do.
I think the pursuit of gay sex and gay relationships can be a form of idolatry (and hence sinful), but the same is true of hetero sex and hetero relationships. Much of what people label "love"is I expect sinful in God's eyes. But not because of the mechanics used, but because of the state of mind reflected.
I also think there's no way I can or should be judging peoples' state of mind just because they happen to profess their homosexuality, any more than I should be judging peoples' state of mind because they admit to liking redheads or women with small breasts.
And as an anarchist, I see no reason why the state needs to be involved at all in deciding who gets married and who doesn't.
I understand why we might need to have fishing or hunting licenses (namely to prevent the tragedy of the commons). I fail to understand why we need to have marriage licenses if the people involved are "adult" and consenting.
And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.
Romans 12:2 (NKJV)