Most people understand that God can frogive their sins, yet they have a difficult time believeing that He can keep them from sinning. We are reconciled to God by His blood and saved by His life.
Therefoe it requires Christs death on the cross to forgive us and His everlasting life to keep us from sinning.
This power extends to the law of heredity. Now that is good news!
Read this short article by Alonzo T. Jones