My friend Mark from Proclaim His Word Ministries (find him here on youtube), did another good documentary on those who consistently accuse others of being false converts. I suggest listening once, then using it as a study. Stop and look up the Bible verses. God bless your time in His Word.
For they being ignorant of God’s righteousness, and seeking to establish their own righteousness, have not submitted to the righteousness of God. For Christ is the end of the law for righteousness to everyone who believes. Romans 10:3-4
But we are all like an unclean thing, And all our righteousnesses are like filthy rags; We all fade as a leaf, And our iniquities, like the wind, Have taken us away. Isaiah 64:6