I know that many believers think the mind of God is unknowable or at least highly difficult to discern to us mere mortals, but I wanted to see if any religious folks had an opinion on this question.
I also know that many people who believe a religion that says homosexuality is a sin do not treat homosexual people poorly (as some Christians say, "we are all sinners"). That doesn't matter for this question; this question deals with why the holy texts of various religions denounce homosexuality -- even if you are a person who is okay with being friends with and respecting homosexuals yourself.
1) Why do you think God or Allah or whoever you believe in would denounce homosexuality? What harm does it do to God?
2) Does God think homosexual acts in non-human species is also an abomination?
I cannot answer your question from a religious perspective, but I can at least speculate at why so many cultures consider it an abomination.
I will approach this debate from a perspective of a heterosexual male. As a heterosexual, I find women to be attractive and find it normal by emotion and instict for people to be attracted to women.
I emotionally find any sort of sexual intercourse with a male to be disgusting, and I would never do it. The very idea of a male making out with a male is emotionally revolting. Because that is how I emotionally see the world, it is emotionally revolting to see men making out with each other. These emotions are genetically based and is the reason why men make out with women in general throughout history.
Gays and bisexuals have a different set of emotions regarding reproduction and may even find reproduction with the opposite sex repulsive. We cannot all be bigots about reproduction, hating each other for conflicting with our subjective emotions.
We must realize that what gender you make out with really doesn't matter, is entirely subjective and emotions, and just because you feel a certain way does not mean everybody on earth must conform to it. I choose not to judge homosexuals by my reproductive instincts, but rather I judge them by their personalities. There are many good homosexuals and have several friends with that orientation.
Many people today are not as broadminded as I am and choose to dislike homosexuals because their genetically incouraged insticts say that homosexuality is repulsive. People were even less tolerant thousands of years ago and because they emotionally found homosexuality repulsive, and they were in the habit of making up dieties, they decided that their deities disliked homosexuality too.
People today have faith in many of these deities so they have faith in the idea that homosexuality is wrong. These are reasons religious people seem especially repulsed by homosexuality. This faith that homosexuality is wrong drives this natural repulsion toward homosexual acts even further, while my logical arguments concerning the subjectivity of sexual attraction has mostly subdued it.
