Mankind has undergone the oppression and dominion of sin almost from the time of the earth's inception. Shortly after the creation we have suffered from effects of sin. The Bible recounts for us the fall and entrance of sin into the world (Genesis 3:6; Romans 5:12). Those who deny this, do so because of blindness.
Adam's sin was passed down or, imputed to us. It was charged to our account. It was placed on our side of the balance sheet. He was our head whom God chose to represent all of mankind. His sin is our sin. Not fair? Was it fair that God rescued some of us by placing our sin upon the one who never sinned? This is called imputation, whereby God placed our guilt upon his perfect sinless son Jesus Christ so that we might become just in the eyes of God(2 Corinthians 5:21). Was this fair to him? We don't want fairness, but mercy and grace.
Make no mistake, those who are not just in themselves have been justified and declared to be righteous because of the actions of Jesus Christ. They place their faith in him as their substitute. Their eyes have been opened and they now realize their guilt before God and the fact that they can be saved from the wrath of God by accepting the work of Jesus Christ on the cross as payment for their sin. Payment in full. Because of this, the birth of Jesus Christ is the single most important event in history. He was the Son of God. He was
Immanuel, God with us. Though we do not really know when exactly he was born, we can rejoice in the fact that he came, was obedient unto death, and conquered sin.
Merry Christmas to you.