BUT, that doesn't matter.
The Bible (ergo God) says it's a sin. And even people who aren't Christians or Jews who have read the Bible cover-to-cover know it contains absolute wisdom. And this wisdom is applicable to individuals, families, societies and cultures, even the entire world.
God doesn't declare "this is a sin and that is a sin" just to be capricious. He's protecting us.
Sins are more than just an insult to God. Sins are destructive to each and every one of us.
Bottom line, however one developed a proclivity for homosexuality is irrelevant. Whether you got there by grooming, by being born that way, or whether because you simply got a bump on the head and ended up there...it must be dealt with like all sin. A person must eliminate that behavior from his human activity.
And unfortunately for any sinner of any kind, it isn't just behavior that must be eliminated. As Jesus said (and this makes a massive amount of sense), it must be eliminated from our thoughts and fantasies.
I know several people who have repented of homosexuality and eventually overcame their same sex attractions.
God provides grace to walk in His righteousness. He set me free from the sins I was bound to. I know men who were drug addicts, alcoholics, adulterers, and brawlers who have been set free.