Again, I see there is some room for more clarification. When I say it doesn't matter whether it is a sin or not, I am referring to the debate itself. In Christianity, God speaks to your heart. It is only there that one can know the difference between sin and sanctified. Where it doesn't matter is in the debate because the debate could only reach one of those two conclusions.
Those people who use theology to justify their attitudes, and worse their actions, will be judged harshly by God one day. They have violated God's command to not use the lord's name in vain. And in so doing they have worked against God's plan to include someone in his kingdom. They will not be thanked for that.
Jesus said blessed be the peacemakers for their's is the kingdom of heaven. He dined with tax collectors and sinners. And the only people he really ever got in arguments with were the religious leaders of his day. Now 2000 years later, the people are just turning against his teachings and trying to control his kingdom for their own self interests.
My belief is this about the sinfulness of homosexuality. I believe it can be a sin for me, and not for you. The reason is this, throughout the gospels Jesus spoke about God as the Father. Anyone who is a father or had a father knows that although a father may love all his children the same, he doesn't treat them all the same. In fact, a perfect father will give perfect rules for each child to follow and raise them to be their personal best. If God wants you to be gay, and you fight your whole life to be straight, then you are going against God's wishes and therefore sinning. On an individual level, I can't say whether that is true for one person or another or not because I'm not God.
Again, I hope this makes my thoughts clearer to understand. My cat helped me type this incidentally.