There are basically three spots in the Bible where homosexuality is condemned. The first is the story of Sodom and Gomorrah, where Lot is told to leave the wicked city of Sodom which is about to be smitten for its immorality. The second is in two parts of the same total, one in Exodus and one in Leviticus, both of which are laying down God’s law for the Israelites. The third is in the new testament, where the apostle Paul mentions it as kind of an aside. I do not believe it comes up at all in the Gospels, which is an important point. (If I’m wrong on this, please quote chapter and verse in the comments.)

I am hardly an expert on this, but I have heard otherwise from some who are.

The key sin of Sodom and Gomorrah seemed to be unkindness to strangers. Didn't Lot offer his daughters to a mob to defend some strangers? That seems an unlikely offering for a strictly-gay mob.

The Leviticus prohibition is clear enough. It's right there with the prohibitions against wearing mixed-fiber garments and eating shrimp. I believe that all but one of those laws were declared irrelevant for most Christians -- the one exception being sacrificing to gods other than Jehovah.

Paul mentioned something which is now translated as homosexuality. He used a word arsenokoites which ... um ... doesn't appear in any other surviving Greek writings, and we don't have a very good idea what it means. Classicists think it refers to frequenting temple prostitutes. (But we can be pretty sure it doesn't mean "homosexuality" as we understand the term, 'cause it wasn't a Greek concept -- they had the same range of activities, but they were thought of quite differently.)

In any case, it's not a major topic in the Bible, I don't think.