How does original sin affect salvation?

If original sin means every person is born spiritually dead and morally corrupted rather than merely capable of occasional wrongdoing, then it fundamentally shapes what kind of rescue is even possible. A person who is sick can, with effort, get better. A person who is dead cannot revive themselves no matter how hard they try. Paul describes the natural human condition in exactly these terms: you were dead in the trespasses and sins in which you once walked (Ephesians 2:1-2). Not sick, not weakened, but dead.

This is why salvation cannot be a cooperative project in which God does his part and the sinner contributes theirs by sufficient moral effort or religious performance. Paul's summary of humanity apart from Christ leaves no room for self-improvement as a path to God: none is righteous, no, not one; no one understands; no one seeks for God (Romans 3:10-11). Original sin does not merely damage our behavior; it disables our very capacity to seek God on our own initiative.

Because of this inherited condition, Scripture insists that salvation is by grace alone, received through faith, and not the result of human works. For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast (Ephesians 2:8-9). If original sin left us merely weakened but still able to take the decisive first step toward God on our own, salvation could rightly be a shared achievement. Because it leaves us dead, salvation must be entirely God's initiative from beginning to end.

Paul underscores this with equal force in Titus: he saved us, not because of works done by us in righteousness, but according to his own mercy, by the washing of regeneration and renewal of the Holy Spirit (Titus 3:5). Regeneration, the new birth, has to precede and enable faith, because a spiritually dead person cannot generate spiritual life in themselves any more than a physically dead person can command their own heart to beat again.

The gospel's answer to original sin is not human effort but divine power. God, who is rich in mercy, because of the great love with which he loved us, even when we were dead in our trespasses, made us alive together with Christ (Ephesians 2:4-5). The same grammar of death and resurrection Paul uses for Christ's own bodily resurrection, he applies to every believer's spiritual rebirth. Salvation is, quite literally, a resurrection performed on the spiritually dead.

This is why Jesus told Nicodemus, a religiously devout and morally serious man, that he must be born again, adding that no one can see the kingdom of God unless he is born of water and the Spirit (John 3:3-5). It was not that Nicodemus needed to try harder at religion; he needed an entirely new birth that only God could give, because that is precisely what original sin had made necessary for every single human being, however respectable.

Understanding how deeply original sin affects salvation should humble every believer permanently. No Christian ever has grounds to look at an unbeliever, or at their own past self, with contempt, because the only difference between the saved and the unsaved is not superior character but the sovereign mercy of God reaching down into spiritual death and raising up life. What do you have that you did not receive (1 Corinthians 4:7).

But this same diagnosis is also tremendously freeing. If salvation depended even partly on overcoming original sin's corruption through your own strength, no one could ever have real assurance, since no one can be certain their effort was enough. Because salvation is entirely God's gracious work from regeneration to final glory, the believer's confidence rests not in their own performance but in the finished work and unfailing power of the one who saves completely those who draw near to God through him (Hebrews 7:25).

Because original sin affects every human being from conception, sincere Christians sometimes worry about the eternal state of infants and children who die too young to consciously repent and believe. While Scripture does not address every detail of this question, it consistently portrays God as one who deals with each person according to what they could reasonably know and do, and who delights to gather in the weak and the helpless (Matthew 19:14). David's confidence that he would one day go to be with his deceased infant son, rather than the child coming back to him, has long comforted grieving parents (2 Samuel 12:23).

This does not mean original sin is unreal or inconsequential for the very young; it means that the same God who justly counts all humanity guilty in Adam is also the God whose mercy is wide enough to be trusted with what he has not fully explained. Original sin describes the problem every person faces; it does not describe the limits of God's compassion in applying the remedy he himself provided.