There’s a great article by Dennis Prager from 1993: “Why Judaism (and then Christianity) Rejected Homosexuality.”
It’s a good but long read which clearly states the position that “homo” stuff is not good and that marriage, i.e. one man and one woman, is the moral fabric of Western Civilization.
I highly recommend this article and if anybody from that community you know wishes to try to proselytize you, hand them a copy of it and walk away.
Leviticus NIV
18:22 Do not have sexual relations with a man as one does with a woman; that is detestable.
20:13 If a man has sexual relations with a man as one does with a woman, both of them have done what is detestable. They are to be put to death; their blood will be on their own heads.