"If a man lies with a man as one lies with a woman, both of them have done what is detestable. They must be put to death; their blood will be on their own heads." (Lev. 20:13)
That homosexual activity is both abnormal, detestable and wrong is well attested in the ancient world.
The point of the levitical command is stated at the end of ch.20: "You are to be holy to me because I, the LORD, am holy, and I have set you apart from the nations to be my own."
Today the church accomodates itself to the sexual practises of the nations. In so doing it has made a statement: we are not set apart by God, and we do not belong to Him.