The true motive of the doctrines of original sin and justification by faith
The doctrine of original sin teaches that humanity came under the influence of sin through Adam, and as a result, human beings either inherited Adam’s sin or had their nature fundamentally corrupted. Likewise, justification by faith teaches that a person is justified before God not through works, but through faith. The church combined the doctrines of original sin and justification by faith to construct an integrated system of salvation. Because human nature itself is believed to be corrupted and imperfect, it is considered inevitable that people will continue committing sins to some degree throughout life. Consequently, a doctrine of salvation was developed in which merely confessing Jesus as Lord grants an immediate ticket to heaven, allowing one to board the train of righteousness accomplished by Jesus on the cross. In effect, this became a product even more advanced than the indulgences sold by the medieval church.
From the perspective of political stability and system maintenance, such a framework proved economical and efficient, which is why evangelical theology became dominant within Christianity. The explanation that human beings are totally depraved, incapable of performing righteousness on their own, and therefore must depend entirely on Christ’s substitutionary atonement on the cross for salvation was something most denominations could affirm without much difficulty. By adding the qualification that believers should nevertheless strive to live holy lives even though their entrance into heaven is already secured, the system could also defend itself against moral criticism.
However, this way of thinking itself arose because people, being of the world, distorted God’s word. God clearly said that He shows no partiality and repays each person according to their deeds. Yet people who have departed from God do not understand sin itself as separation from God; instead, they treat it as an unavoidable loss. In other words, because righteousness is viewed in this world as something accumulated like wealth, people assume that if they have done many righteous acts, committing one or two sins is not a serious problem. They regard it as merely a small loss from a large reserve of moral assets. The church, based on this understanding of sin, developed the doctrines of original sin and justification by faith in order to justify it.
But Jesus said that the world does not even know what sin is according to God the Father, and so He compared the forgiveness of sins to the cancellation of debt. The cancellation of debt refers not to part of it, but to all of it. In the same way, when a person abides in righteousness—that is, abides in God—former sins are remembered no more. Likewise, no matter how righteously a person may have lived, the moment one commits even a single sin, righteousness is gone, and death comes through that sin. This is what God means when He says that He repays according to one’s deeds. Excuses such as “I did my best” carry no weight.
The righteousness and sin of which God speaks are life and death. No matter how long a fish has lived in water, once it leaves the water, it will soon die. No matter how desperately a fish struggles and gasps outside the water, the moment it returns to the water, it lives again. But what does the world do? Those who have gained a reputation for doing many righteous deeds are praised as virtuous people, and people say that committing one or two minor sins was merely a mistake that can be overlooked. Those who have gained a reputation for committing many sins, however, are branded as hopeless sinners and prevented from escaping that label, even if they repent and try to live rightly. In this way, the world has separated life from righteousness and separated death from sin.
But the one who has died with Jesus on the cross, received eternal life, and been born again is at the same time righteous. Whoever repents and returns to God is cleansed completely, as though their former sins had never existed.