God’s Justification allows the sinner to become eligible to have the Holy Spirit. The Holy Spirit enables the justified man – to do the will of God.
Faith in the Lord Jesus Christ brings God’s Justification upon a penitent man. By God’s Grace the penitent exercises belief, faith, and trust in Christ – therefore the moral make-up is made righteous.
The beauty of being a Christian and not just religious. Christianity justifies sinful men to be made righteous. All righteous men (just men) do the will of God.
Romans 5:1-5, Romans 10:10