Nature is what it is. I'm not sure what 'God' is so I cannot comment whether 'God' is nature or nature is 'God'.
...
Gay men are physically capable of having sex with women, so your talk about disability does not make sense. They can physically have sex with straight women or have children through artificial insemination. Their sexual preference is hardly a disability. They can reproduce if they want to. There are many examples of gay men that have been married to straight women and had children.
As for 'fixing' gay genes, well, who says we should be fixing anything.
We are doing enough 'fixing' of nature as it is.
...
PS. Not having to worry about God and scriptures, will free up your mind. Try it. Your mind will become very lucid in no time.
I am sure you would agree that there are a lot of "natural" things that are not good things. It is natural to steal if you can get away with it. It is natural to want to have sexual relations with your neighbors wife if you are heterosexual and she is young and attractive. It is natural to want to murder your arch enemy if you can safely do so and avoid punishment.
Nature is clearly not always good. That's why you have your one moral rule. Some form of overarching moral structure is NECESSARY or we truly degenerate into something worse than an animal.
Let's run with your theory and say homosexuality is a culling mechanism like cellular apoptosis that occurs at some low frequency randomly and is triggered by severe environmental stress or toxic exposure. I cited several studies above showing that homosexuality is induced in animals by multiple different toxins so your theory is plausible.
If we are condemning large number of children to genetic death in the womb or in early childhood because we are inadvertently poisoning them with toxins or by placing them in situations of severe environmental stress are we not harming them? Isn't that a huge violation of your moral standard of do not harm others and in need of urgent and critical rectification?
Gay men are physically capable of having sex with women. They can reproduce if they want to. The problem of course is that they don't want to and that lack of desire is in part not a choice. If that lack of desire is in any way the result of human action however unintentional then they are victims of a horrible crime. One we have a moral obligation to understand and reverse if the victims wish or at least stop committing in the future.
If you are serious about your moral standard and truly believe your own theory about homosexuality I am curious as to how you can see it any other way.