Unless a person is drawn by God, he will not truly become a Christian, because the only way he can receive mercy is if he sees himself as a sinner and that he needs God's mercy and abounding grace in order to become an adopted child of God. We can present the Good News of Christ, but cannot reason with the people we witness to but hope that God will expose their sinfulness and let them see their need for a Savior.
In response to receiving forgiveness, a soul repents and turns away from temptation of sin, and desires to please the Father.
The problem today is society seems to be more receptive of sinful behavior , making excusses for sinners or just plain overlooking immoral,sinful behavior. Or even worse, perverting the Word of God to make sin exceptable.
I could not even name what percentage of Christians today are unrepentant. Only God knows.