Imagine a culture where children are often betrothed, and they are married by the time they reach sexual maturity, and society expects them to use their sexuality, in a manner that is exclusively useful to their spouse, and indirectly beneficial for society as a whole. Do you think there is any room for homosexual behavior? Do you think the people who created this system are inherently bigoted?
Bigoted, no. Backward, definitely. That was the norm until early-modern times, and it served to promote conformity within the community, preserve the identity of religious minorities, and solidify the rigid class structure. It is now backward in the sense that writing with a quill pen is backward.
As for homosexual behavior -- it was typically done on the sly. Can you imagine what a miserable marriage that would have been? What for? Tradition? What was a delight for many was drudgery for the homosexual.
Sure, tradition was everything. But we don't let tradition dictate our lives, do we, today?
The world is full of people who lack understanding. The Judeo-Christian world refuses to acknowledge their departure from the Old Testament system of betrothal and teen marriage, which is the genesis of most anti-homosexual cultural rules. The anti-theist movement is largely unsympathetic to the plight of ancient people, who were merely trying to reproduce and survive. They suppose, instead, malice aforethought, as if ancient people could have foreseen modern existential crises.
We are no longer responsible to those ancient people. We can neither harm them nor do good. Marriage between people fourteen years old, once something 'natural', is now unconscionable. We have enough people as it is, and we have no need for a population explosion. As for the 'wisdom' of ancient peasants -- they accepted much that we now find abominable, like slavery and a death penalty that encompassed such offenses a witchcraft.
I suggest that you ask the experts on what the Old Testament says. The real experts. The Jews. They do not kill witches. They do not kill children for talking back. They do not tolerate slavery. On the whole they get good results for their lives.
Society is also largely ignorant of sexual practices of ancient people, who were not necessarily opposed to behaviors like incest, bestiality, adultery, rape, polygamy, sexual slavery, prostitution, sex with minors/children, etc.
Except for adultery, all of those are abominable and often illegal today on the grounds that such are cruel, exploitative, or destructive. You contradict yourself by on the one hand admiring the ancients for their sexual wisdom and on the other hand excoriating their sexual depravity. Some of the behavior of ancient Hebrew kings is now unthinkable -- like having harems. I respect the Old Testament for showing the consequences (tragedy for the victims and at times self-destruction of the perpetrators)... and those are valid warnings to us today. I have never had any use for sex with children, but the secular explanation from Sigmund Freud -- that children find sex unwelcome and painful -- is good enough for me. The repugnance that most of us have against rape is now that is violates the right a female who does not or cannot consent (a feminist approach) -- in contrast to the violation of a man's possession of sexual rights to a wife. The feminist approach is a stronger judgment against rape.
As for adultery -- it hurts children by gutting their certainty about the trustworthiness of their parents. Adultery depends upon lies and deceit that hurt children.
The triumph of Judeo-Christian sexual propriety is not problematic in the grand scheme, and pretending otherwise is a pointless waste of time. The people who drifted away from a strict interpretation of anti-homosexuality scripture did not do so under duress, and it is as silly to think that change-averse religious doctrines will evolve under duress as it is ridiculous/immoral to imagine that religious pressure can change someone's sexual orientation.
Even if one thinks homosexuality something less than ideal, one cannot see it evil in the sense that murder, robbery, rape, perversion of justice, the making of fraudulent oaths, denying rest to employees, and abandonment of the elderly are gross affronts against the morality that underpins a wholesome society. Know well: no part of the Bible says anything that specifically prohibits the use or dealing in narcotics... or driving drunk. So far as I can tell, homosexuality is an indelible part of the character of people. At least it is not sociopathy or even narcissism.
Did you see the video to which I linked? I saw no Christian morality in the foul-mouthed, violent brute who attacked an alleged gay. I am sure that if you are a Christian that you would never testify to the 'wrongness' of homosexuality with a kick to the groin. Taking down the violent brute who had shown a willingness to inflict severe and pointless pain looks like Christian behavior. Violent hatred against homosexuals does not match the command of Jesus to love thy neighbor as if oneself.