Everyone one is born with a fallen sin nature, which we inherit from our parents. Nobody can change who they are, anymore than a Leopard can change his spots.
Children don't need to be taught how to lie, or steal, or disobey their parents or fight against their siblings. But they need to be forced to do the right thing, by threatening them with corporal punishment.
Everyone is a natural born sinner, and nobody can change themselves and turn from their sin and surrender their lives to God. Sin is not a static thing, the longer a person lives to deeper they plunge into depravity. So they become more and more hardened and their concise is seared with a hot iron, making it impossible for them to repent.
Jesus made it clear on many occasions that, that it is impossible for man to repent. He likened it to being born again, and when Nicodemus said. "This is impossible, who can be saved then", the Lord agreed and said, but all things are possible with God. That has to mean, that salvation is of the Lord and not by mans choice