First of all, it may be your view that "God does concern himself daily with his creation. After all, the Bible states we were created for Him. " but I am not a follower of the God of the Bible, so that statement means nothing to me; however, I'm not offended by statements based on disagreements of that kind.
What I do find offensive is the claim that "God instituted married between a man and woman. " No, man instituted marriage.
You continue with:
"Why? Because even in nature, the mammals come together as male and female. It's the "natural" thing to do." For the sexual act, in the majority, yes.
As for bonding, it is just as natural for man to bond with man and woman with woman. Some of the most beautiful relationships have been the close bonding between people of the same sex.
If man can create marriage of opposite sexes and claim that is what their God wants, I see no reason why man cannot create marriage for same sex lovers and claim that it is what their God wants.
Marriage is not just about sex and pro-creating and "God's blessing" but about legal rights. Probably always has been.
AIDS is NOT exclusive to the gay community - this is the part of your post that offends me most. I'm sure you must be aware of the scale of those infected in Africa? I lost a gay male friend to AIDS and he was a lovely Christian boy who I, when I was still a Christian, told me that he couldn't go to church anymore because God hated him, and he couldn't understood how a God he loved could have created him the way he was. At that time I felt (and still do in my own way) that yes, God created him the way he was and that same God loved him just as he was.
I am not gay, but I feel very strongly about this issue and couldn't just let this pass without a response.