"For He made Him who knew no sin to be sin for us, that we might become the righteousness of God in Him." (2 Corinthians 5:21)
When a man receives Christ, he receives a new life; he’s as one who never existed before: a new creation in Christ. This new life is the life of righteousness; superior to sin, the devil, death and hell. This new life is the reason you can live a righteous life. The reason men sin is that they have the nature of sin. That nature is supplanted by God’s nature of righteousness when a man is born again.
It wasn’t just a mere change that took place in you when you were born again; it was an actual replacement or supplanting of the life and nature of sin by the life of righteousness. Real Christianity isn’t the inclusion or impartation of another nature, but an actual recreation of the human spirit by God. You’ve come alive to God through the new birth. Thus, it’s natural for you to live right and fulfill the will of the Father.
Religion teaches that if a man would live right, then God would qualify him to be a righteous person, but that’s a contradiction. No one can live righteously, until He’s first made righteous by God. God’s righteousness in your spirit is what gives you the ability to live right.
Hence, in Christianity, what God does is to first make you righteous, before He’d be justified to expect you to live right. The Bible says Jesus Christ died on account of our offences, and was raised back to life for our justification (Romans 4:25). Justification means to be declared righteous. Blessed Be God!
I’m born of God and have His nature of righteousness in my Spirit. As Jesus is, in His glory and righteousness, so am I in this world. I’ve been born into a newness of life; I’m the righteousness of God in Christ Jesus, called into the fellowship of the Godkind. Hallelujah!
Further Study: Romans 5:17; Romans 8:1-4