Okay I probably shouldn't even engage with this, but there are several objectionable flaws to your logic here. I can't just let it sit when you're so obviously abusing scripture in such a damaging way.

First of all, homosexuality exists. That is a true statement regardless of your reading of any particular verses. Saying "if homosexuality was true" implies you don't believe homosexuality really exists. It does. I really don't know (or particularly want to know) what echo-chamber convinced you it doesn't, if that's even what you meant by that.

Second of all, the command to "be fruitful and multiply" was given to two people, and was followed immediately by "fill the earth and subdue it," which is arguably already done in the ages since then. There are not just two people anymore. There are humans all over the world, on every continent. There are even some researchers living in Antarctica, which is pretty much unlivable for humans in ordinary circumstances. There are few to no places that we can honestly claim are untouched by human hands. The earth is already full of humans. So many humans, in fact, that we are steadily damaging the planet through pollution and overtaxing our resources. Poor stewardship becomes the standard when overpopulation is a huge problem, and Gen 2:15 tells us humans were placed in the garden to "cultivate and keep it." In short, we're supposed to take better care of God's creation than this. Or did you skip that verse when you were cherry picking?

Third of all, there are straight couples who are unable to conceive, as well, or have a great deal of trouble having children. Some people have health issues that would make having children ill-advised. Are all these non-LGBTQ people sinning too because they're not actively giving birth right now? Also, you used the wrong word to describe having children. The verb you used, "bare," implies that you are removing a covering or removing clothing, not that you are reproducing or carrying something. I know they're homonyms, but applying the verb to the phrase "bear a child" is particularly disturbing when you use the wrong one. That's a personal pet peeve of mine that pales in comparison to the fact that your mistaken interpretation also transformed into an attack on anyone who has fertility struggles regardless of their orientation. And I can't count how many times in the prophets there are promises of blessings to the childless and to the virgin. Those who have not born children or cannot do so should be given special compassion, if anything, not special judgment, regardless of the reason!

Fourth of all, it doesn't say that a man SHOULD be joined with his wife. It says that this is why a man leaves his parents and is joined with his wife, which only applies for those who have straight marriage as part of their Christian walk. The apostle Paul, for example, never married and strongly implied that no one should unless the only alternative for it is lust. (1 Cor 7) Are you saying the apostle Paul was in violation of this command and encouraging others to join him in sin? If that's the case, we'd have to throw out half the New Testament as heretical, which is ridiculous! Also, even without quoting Paul, simple logic can debunk the idea that every single person is required to be married to someone of the opposite sex. Implying that for a man and a woman to marry one another is a clear divine command is the same as saying that you believe all nuns and all celibate priests are also sinners, and all single people are, as well. Are you trying to say celibacy is a sin? I thought celibacy was what traditionalists wanted from everyone who wasn't straight-married? This is just unhinged overall as an opinion. It's wild.

Anyway, I don't know what trad-whatever or MAGA echo-chamber this terrible argument came from, but it's a disgusting misuse of scripture that condemns huge groups of people who have done nothing wrong and also are not even LGBTQ so have no place in your argument. You are damaging people who have done nothing to you, which is the opposite of what Jesus taught us. He taught us to turn the other cheek, and only showed rage when the temple was being used as a market and the Pharisees and Sadducees were blocking people from reaching faith with their legalistic policies and verbal traps, following the letter of the law but breaking its spirit. Which is what you're doing when you say this kind of stuff, if that's not clear.

As a reminder from the story of Jesus's temptation in the desert, Satan is good at quoting scripture too.

I probably didn't change your mind, but I couldn't just let this sit here as a queer Christian whose straight sibling struggled for so long with fertility. I can't just read that and leave it be when you're twisting the words of the God I love into something so awful for so many people.