1 Corinthians 6:9 lists sins (including homosexual practice) that preclude inheriting the kingdom; false teaching on these sins subverts the gospel.

Mike cites 1 Corinthians 6:9-11: "do not be deceived" — the Bible anticipates people will be deceived on this. The list includes sexually immoral, idolaters, adulterers, men who practice homosexuality, thieves, greedy, drunkards, etc. "Such were some of you" — salvation transforms. If someone teaches that people can stay in these lifestyle sins, they are deceiving people about the nature of the gospel and leading them away from repentance.