Biology and genetics are pretty cut and dried.
Any gene that is counter to reproduction, for example, the exclusive preference for same sex intercourse (male/male OR female/female), dies out with the carrier.
Homosexuals aren’t generally breeders. It, meaning the homo gene, isn’t reproduced to continue on in the gene pool. So the anathema to “breeders” would, on its own, cause homosexuality to disappear. The “we’re just born that way” as an excuse doesn’t hold up.
So sorry.
I do not for a moment justify homosexual behavior by an means. I am only trying to point out that for some reason/whatever reason, some men and women choose to manifest their sin natures via homosexual acts. They are condemned by a holy God for these sins in just the same way the other people are held accountable for their sins. The man who expresses his sin nature by acts of homosexuality is just as guilty before God as the man who expresses his sin nature by acts of heterosexuality outside of marriage.
This why the writer to the Hebrews states that marriage is honorable in all and the bed is undefiled. The heterosexual can express his sexual capacity in marriage and be free from sin in that expression. While the homosexual cannot avoid committing sin in any expression of his sexual capacity.
Repentance and forgiveness is as available to the homosexual as it is to the heterosexual who is exercising his sexual capacity outside the sanctity of marriage. And of course, this points out the main reason that homosexuals are to be denied entering into marriage with another of the same sex.
Homosexual marriage is wrong because it is wrong to be homosexual in the first place.