Are you for real? The prohibition first appears in Leviticus, one of the oldest books of the Bible. The idea that the early Christian Church of 1700+ years ago foresaw the development of the issue of homosexuality and took steps to prevent it is one of the most ludicrous, absolutely brain dead, not to mention just a bit on the paranoid side, arguments I have ever seen.
So you are an atheist. And therefore anyone who has the unmitigated gall to mention religious beliefs are "out of line." Fuck that. That , too, is the very definition of totalitarianism. And I have been in theology classes in which evolution and other scientific ideas are mentioned. No, they do NOT get the same treatment - not even close. And if one did, I would say the same thing about them - especially in an institution of learning, where free exchange of ideas is supposed to be the ideal. Unlike you totalitarians, most people of faith are quite willing to discuss modern ideas and how they fit into our beliefs. Although the hypothetical claim "I think that Muslims are all stupid" is disrespectful, and should be addressed as such. Saying Christianity is wrong - not so much - its simply an opinion. One which you obviously hold to. Am I supposed to be offended by that statement as a Christian? There are a whole lot of people who do not believe in Christianity. And there are a whole lot of people who believe homosexuality is wrong. But somehow it is OK to repress expression of the former, but not the latter? That is what is wrong with your type. You are so egocentrically convinced you hold the absolute truth, you have no problems telling others to STFU if they don't agree.
The OT was written for cavemen so they wouldn't fuck their sisters and eat the poison berries.
The intent of any banning of homosexuality was to preserve sperm for the "be fruitful and multiply" cause. Get serious.