The vast majority of AIDS cases in the world are transmitted through heterosexual sex. Does that make heterosexuality in Africa "unhealthy"? Or does it demonstrate that unprotected sex is unhealthy?
Whether homosexuality is genetically programmed or socially conditioned is irrelevant. (It is likely some of both, just as heterosexuality is -- since there is plenty of evidence that straight people can engage in same-sex encounters. Indeed, the reason that homosexuality is designated a "sin" is because it is tempting; read the history of Christianity if you need proof. You need to do a little more reading about the formal system of educational pederasty in Greece. It was the norm for MARRIED men to engage in that. Thus it demonstrated that sexuality is indeed not entirely given but learned and demonstrates how unstable our definitions of sexuality are.)
BUT...the fact is that homosexuality has been decriminalized by the state and de-pathologized by medical science. There is no futher basis, other than religious proscription, to delegate civil rights like marriage according to sexual orientation. It is perfectly within any church's rights not to sanctify marriages. "Sanctification" has never been granted by the state.
So gay people are perfectly happy to let straight people retain the sanctification of marriage within their own churches while gay marriages are authorized by the state and, if it happens, sanctified by those churches that choose not to regard homosexuality as a sin.
By the way, AAP has repeatedly asked you to demonstrate how two dykes marrying in Boston undermines your marriage and you have repeatedly avoided answering the question, changing the subject every time to say, basically, that you don't personally approve, that your own claims are self-evidently true and in accordance with nature. These were precisely the claims of those who cited the natural inferiority of black people, even relying on the Bible to support their claims. And, of course, the notion that a group of people is "self-evidently" deviant opens Mein Kempf.