The Bible says that homosexuality is a sin. Hate the sin, love the sinner stuff. It doesn't say it’s okay though. This isn’t hate btw. Just a statement. I have many gay friends and they are awesome. :)
Many people think it says a man shall not lie with a man, but it really says a man shall not lie with a man in the same way as a woman, either that or a man shall not lie with a boy
There are more sections that say it’s a sin. Using that reasoning isn’t as useful as you might think. Like I said prior. That’s from the Bible specifically. If you don’t believe in the Bible, then that’s fine.