Christians go by the Bible and don’t cherry pick it if they’re true Christians. They go by what the Bible says about homosexuality being a sin in Leviticus 18:22, Leviticus 20:13, Judges 19:16-24, 1 Kings 14:24, 1 Kings 15:12, Romans 1:18-32(which is New Testament so it isn’t just Old Testament, 1 Corinthians 6:9-11, 1 Timothy 1:8-10, and lastly, Jude 7. If you’ve heard of Sodom and Gammorah, then you’d know that one of the reasons that God destroyed them is that there was much practice of homosexuality. In the Bible, God does not change his mind as we may think, but when the Bible says God thinks homosexuality is an abomination, he means it throughout the entire Bible and not just the Old Testament. He just did more in the Old Testament.