Those of us living a Christ-filled life know better. This is another example of the propaganda of the religious-political extremists. It is incorrect.
Scripture demands no such thing.
When we become a new creation in Christ we are transformed by the Grace of God. Sometimes it is dramatic, and people describe a blessed assurance that they have become brand-new people. Other times we may not notice any appreciable change, and are disappointed. God has His own timetable, and He cannot be hurried. When the realization struck him, he was ashamed.