We would all be incarnate devils!
"The LORD saw how great man's wickedness on the earth had become, and that every inclination of the thoughts of his heart was only evil all the time!" Genesis 6:5
There is the seed of all sins, of the vilest and worst of sins--in the best of men!
Did God leave us to act according to our sinful natures--we would all be incarnate devils, and this world would be an absolute Hell!
"He has rescued us from the domain of darkness, and transferred us to the kingdom of His beloved Son, in whom we have redemption, the forgiveness of sins!" Colossians 1:13