GOD is Just, therefore He has to punish sin.

God says...

"I will not fail to punish sin..."
Exodus 34: 7b
"The person who sins is the one that will die."
Ezekiel 18: 4b

We have a problem: we are all sinners.
The wages of sin is death. We need
forgiveness to have a relationship with God.

GOD solved this problem through the person of...