As we continue these nights together, we’re diving into the doctrine of atonement and why the cross is central to our faith. Read the notes below as we explore the problem of sin, the nature of God, and how Jesus made a way for us to be reconciled back to Him with confidence and clarity.
Overview
When someone becomes a Christian and begins studying the faith, a common yet central question quickly pops up: Why did Jesus need to die on the cross for us?
If God is all-powerful, couldn’t He just forgive everyone of their sins? What is stopping God from “waving a magic wand” so that all of us are instantly forgiven and reconciled back to Him? And why do we need forgiveness in the first place?
To help us answer these questions, we’re going to look at the doctrine of atonement. The doctrine of atonement is an essential doctrine that explains why we are separated from God, and what God did to bridge that separation without denying His nature.
To understand why Jesus died on the cross, there are four key things we need to look at:
- The Problem of Sin
- The Nature of God
- Reconciliation Through Atonement
- The Result of Atonement
Let’s get into it.
The Problem of Sin
The doctrine of atonement begins with the reason we are separated from God in the first place. Since all of us are tainted by sin, we cannot be in relationship with God because of His holy nature.
In other words, sin has created a barrier between God and humanity. This barrier is two-fold: humanity’s sin on one side, and God’s holiness on the other. The two cannot mix.
God is morally perfect and completely set apart from sin. Sin cannot remain in His presence without being judged. It’s like trying to join two ends of magnets together—they simply cannot touch.
We see a picture of this in the Tabernacle in the Old Testament. The Holy of Holies was separated by a veil, and only the high priest could enter once a year with blood atonement. This illustrates the reality that without proper atonement, sin results in separation from God.
So we are faced with a problem: God is holy, and we are sinful. Therefore, relationship with God is impossible in our natural state.
To understand the depth of sin, we consider three aspects:
- Imputed sin
- Inherited sin
- Individual sin
1) Imputed Sin
The word “imputed” means to credit something to someone’s legal account. In this sense, Adam’s sin is credited to all humanity because he acted as our representative.
Even though we did not eat the fruit, Adam’s guilt is legally counted as ours.
“Therefore, just as sin came into the world through one man, and death through sin…”
– Romans 5:12
A simple example is a relay team. If one runner breaks the rules, the whole team is disqualified. The consequence of one action is imputed to all.
2) Inherited Sin
We also inherit a sinful nature. This means we are born with a corrupted nature that is bent toward sin.
We are not sinners because we sin—we sin because we are sinners by nature.
“Behold, I was brought forth in iniquity…”
– Psalm 51:5
Like an apple tree produces apples because of what it is, we produce sin because of what we are.
3) Individual Sin
Finally, we all commit personal sin through our thoughts, words, and actions.
“For all have sinned and fall short of the glory of God.”
– Romans 3:23
These include things like pride, lust, anger, envy, and dishonesty. Whether small or great, all sin carries consequence.
Even if someone never committed a single personal sin, they would still be separated from God due to imputed and inherited sin.
The result of sin is death in three forms:
- Physical death
- Spiritual death
- Eternal death
“For the wages of sin is death…”
– Romans 6:23
The Nature of God
But God…
God is not only just and righteous, but also loving, merciful, and gracious.
“The Lord practices steadfast love, justice, and righteousness…”
– Jeremiah 9:24
God’s love means He gives of Himself fully to His creation. He desires reconciliation, not separation.
“In this is love… He loved us and sent His Son…”
– 1 John 4:10
However, God’s justice cannot ignore sin. If sin is not punished, God would not be truly just.
This creates a tension: God must punish sin, but He also desires to forgive sinners.
Forgiveness is never without cost. Justice must be satisfied.
This is why the cross is necessary.
God does not simply “erase” sin. Instead, He deals with it fully and justly through Christ.
Reconciliation Through Atonement
In order to satisfy both His justice and His love, God Himself provides the solution in the person of Jesus Christ.
“Greater love has no one than this: to lay down one’s life for one’s friends.”
– John 15:13
Christ becomes the propitiation for our sins.
“He is the propitiation for our sins…”
– 1 John 2:2
Propitiation means the turning away of wrath through sacrifice. In the Old Testament, sacrifices pointed forward to this ultimate reality.
On the Day of Atonement, blood was placed on the mercy seat to cover sin and point toward the final sacrifice to come.
Jesus becomes the fulfilment of this picture.
“For our sake He made Him who knew no sin to be sin for us…”
– 2 Corinthians 5:21
Through the cross:
- Our sin is placed on Christ
- God’s wrath is satisfied
- The barrier is removed
- Reconciliation is made possible
This is penal substitutionary atonement: Christ takes our place and bears our penalty.
The Result of Atonement
What does this mean for us today?
“If anyone is in Christ, he is a new creation…”
– 2 Corinthians 5:17
- We rejoice that we are saved
We are not improved versions of ourselves—we are completely new creations. Our sin is forgiven, and our identity is made new in Christ.
2) We share the gospel
We are also given a mission.
“He gave us the ministry of reconciliation…”
– 2 Corinthians 5:18
We are now ambassadors for Christ, carrying the message of reconciliation to the world.
This is why the gospel is not just personal—it is global.
Conclusion
The doctrine of atonement shows us that all humanity is separated from God through sin, yet God in His love and justice made a way through Christ.
Jesus became our substitute, bearing the penalty of sin so that we could be forgiven, reconciled, and made new.
Our sin was placed on Him, and His righteousness is now placed on us.
So we rejoice—and we go.