It's problematic because if homosexuality was the norm, humanity would die out. There are quite a few unreconstructed Darwinians who would welcome that occurrence as the natural order, with a footnote that mankind was never up to much anyway. If it is a physical issue as everyone seems to be saying, perhaps we should approach its diagnosis with the same urgency as climate change, as a threat to civilisation. We don't because we assume it's one of those things, perhaps on a par with a comet hitting the earth as a means of wiping humanity out. It's just there.
Subjecting homosexuality to a religious purview doesn't take us very far into it as a state of being. For Catholics homosexuality isn't sinful, though developing it into a physical relationship is, but so is every other sexual proclivity outside a strictly reproductive and continent married role. Faith isn't about making people feel better about themselves - the dominant discourse of the c21st - it's about sainthood and an almost impossibly high moral bar to achieve it. I perceive no lack of homosexuals in the pews or on the altar, so I don't think Christian belief and same sex attraction is a deal breaker. In the Anglican communion homosexual priests threatened to cause schism, until in a typically Church of England way it was decided homosexuals could be members of the clergy so long as they forsook physical relations. The homosexual vicar and ex-pop star Richard Coles has expounded on the issue, and his thoughts can probably be found on the internet. At some level the CofE think gay sex is wrong, at least as an official line.
On an anecdotal level, I know homosexual people who are as queer as **** and celebrate their instincts with as much abandon as they can muster. I also know gays who exhibit a degree of self loathing, including two who had tried heterosexual marriage and really wished they were straight. I know a number of homosexual men who live lives of sexual abstinence and straight acting couples who live monogamously and have no time for the flamboyant side of gay culture. So I don't accept instinctive homosexuals view their orientation as unproblematic. Do they adopt that position because they have misgivings about their libido, or because they fear societal opprobrium, or they think it's "wrong" on some spiritual/psychic level? I don't know, and maybe they don't either.
What is worrying is the popular idea that debates around sexuality generally are closed, and that there's a modern, "scientific" way of looking at sex, and a medieval way, and the latter is subject to Orwellian realignment. That reminds me of sceptic claims that all the important stuff is already known, and to question the fact is to invite the Inquisition. One of the better aspects of this forum is these subjects can be discussed and disagreed over without demonising the other.
