I'm aware of the change to the DSM-IV. I'm also aware that no culture before now has accepted homosexuality as normative or appropriate, including the Spartans/Romans/Greeks, especially since their gay culture was a horrid rape culture where the passive recipient of the man was belitted/lowered. How horrible.
Then you also must be aware of how we have grown beyond iron-age thinking, such as, "Who did his parents tick off, that he was born blind?" Part of the reason why "gay culture" then was violent, is because of the lack of awareness of the fullness of human sexuality. It was anger born of frustration born out of misunderstanding and the condemnation of their fellows. Most homosexuals are no longer that way, since medical science has provided greater understanding, and since society has advanced since biblical times.
Your example illustrates the same phenomenon in which blacks riot, loot, burn, when one of them is killed through systemic violence. Black people are not "normally" violent. Neither are those who identify as homosexual.
This statement of yours intrigues me, "Science has determined that homosexuality is a normal and healthy expression of humanity." I've also heard recently that science can tell us when life begins or that rape is wrong and consensual sex is good!
Science knows a lot about humanity.
Homosexual activity (not mere desire) is sin in the Bible
Because the writers did not understand that humans are
oriented sexually. Therefore, what is actually a normal part of human identity and expression was seen as "unnatural," and therefore "sin."
The Bible is the very best indicator of how to think, how to trust, when to trust, how to plan, act, live, die and rise IMHO!
So, the bible knows the very best that slavery is a "natural" part of society? It knows that women are "less than" men? It knows that it's OK to kill children? No, I'm afraid the bible is a product of its culture. It promotes love, equity, compassion, mercy, but the ways in which it condones achieving these things is as outdated as the cultures that produced it. We're not living in the Iron Age anymore. we are constrained to live out love, equity, compassion and mercy from our own societal perspectives.
As a Jew who has experienced racism/persecution/violence, I sympathize with being singled out for you are. Biblically, though, being gay is not who you have to be going forward IMHO.
Since the bible never addresses "being gay," I don't see how it can teach that "being gay is not who you have to be going forward." This is nothing more than eisegesis on your part. I would stand on the same ground as you do if I said that the bible teaches that you don't have to be a Jew going forward. Jesus came to do away with Judaism when he started the church. You can (and should) change your religion, just as homosexuals can (and should) change their sexual identities. You see how this works? When we don't take time or effort to exegete the texts, we can justify and purify all kinds of systemic violence in the name of religion.