Paul is talking about a different group of people, not those revelling in sins, spoken of in chapter one, but a religious self-righteous group. They have the law, but do they know how to use it? They think they are saved, even above everyone else. What does Paul have to say about their behaviour? What can we learn from their mistakes? Have we made the same judgmental remarks to others? We all fall short of the glory of God. God would judge all fairly and there is only one way to live up to God's standard of perfection. When Jesus died for us on the cross, He ended any hope of salvation through the Old Covenant as Romans 1:16 says, the Gospel is the power of God for the salvation of everyone who believes.