The Singular Nature of Christianity, Forgiveness of Sins and an Imputed Righteousness

"[The sinner] needs not light but life - not philosophy and science, not new discoveries in heaven and earth, but a Savior - a Savior who can pluck him from the wrath to come, arrest the avenger of blood, seize the sword of justice, put it up into its scabbard, bid it rest and be still. The glory of Christianity is its Savior, and His power to save is in the blood by which he extinguished the fires of the curse, and the righteousness by which He bought life for all His followers. Jesus made [to be] our curse, Jesus made [to be] our righteousness, this, this is the Gospel! All else is philosophy and vain deceit. This it is which gives Christianity its power" (James Henley Thornwell, "The Necessity and Nature of Christianity").

Thornwell above takes two statements from Scripture, and turns them into the beautiful doxology above.

"All who rely on works of the law are under a curse; for it is written, 'Cursed be everyone who does not abide by all things written in the Book of the Law, and do them.' Now it is evident that no one is justified before God by the law, for 'The righteous shall live by faith.' But the law is not of faith, rather, 'The one who does them shall live by them.' Christ redeemed us from the curse of the law by becoming a curse for us—for it is written, 'Cursed is everyone who is hanged on a tree'— so that in Christ Jesus the blessing of Abraham might come to the Gentiles, so that we might receive the promised Spirit through faith" (Galatians 3:10-14). Paul draws a parallel between what men are, cursed because of our failure to keep the Law in all of its exhaustive detail, and what Jesus became, cursed by imputation of the sins of God's people to their surety, Jesus Christ.

"If anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come. All this is from God, who through Christ reconciled us to Himself and gave us the ministry of reconciliation; that is, in Christ God was reconciling the world to Himself, not counting their trespasses against them, and entrusting to us the message of reconciliation. Therefore, we are ambassadors for Christ, God making His appeal through us. We implore you on behalf of Christ, be reconciled to God. For our sake He made Him to be sin who knew no sin, so that in Him we might become the righteousness of God" (II Corinthians 5:17-21). And this is the imputation the other way, His righteousness becoming ours by means of faith alone.

The truth of double imputation is one of the things that make Christianity unique from any other religion, or any other form of salvation. It is in Christ alone that we find both our needs met in one place, the need to have our sins forgiven and our need to have them replaced with true righteousness.