All of mankind are sinners, because they have disobeyed God. No created being could pay the penalty for his own sin, much less for others. Yet God has said, "the wages of sin is death." Rom. 6:23.
Only the death of a Perfect One could satisfy the demands of God's justice. And God's love provided that perfect One: The Lord Jesus Christ! Jesus died in our place to give us His eternal life. "Christ... once suffered for sins, the just for the unjust." 1 Peter 3:18.