Having come from an abusive family (let's just use that broad term and leave it at that) I can say that there is nothing sacred or innately right about a man/woman coupling.

Being in a man/woman relationship doesn't mean shit in the grand scheme of human rights and rightness. What matters is that the two people come together for the right reasons, love, humanity, whatever.. And that their offspring, be it genetically their own, adopted or arising from some other method, are raised well, provided for, and loved.

Whether god created marriage or not ? Marriage is a human creation, it takes on different forms in every culture. It is a social device. Love is an emotion, and if god created us,he created our emotions. They are not something we can just choose. When we love, it is largely out of our control. If a woman finds she loves a woman, or a man a man, and this is driven by something deeper than the immediate prospect of getting laid, it is a greater emotion, and if it happens that we as beings and all about us was created by god, isn't this true and real love not also then created by "god".

I'd rather have been raised in a caring, loving, safe home by two men or two woman.