Galatians 4:4-5 (NKJV)
4 But when the fullness of the time had come, God sent forth His Son, born of a woman, born under the law, 5 to redeem those who were under the law, that we might receive the adoption as sons.
God gave the world His Son so He could live out a life free from sin; something mankind was unable to do. God did this in His time, in His way, for His purpose that we would become adopted heirs of heaven by placing our faith in Christ.
The genius of Christianity takes the words of Paul "who gave himself for our sins" as true and efficacious. We are not to look upon our sins as insignificant trifles. On the other hand, we are not to regard them as so terrible that we must despair. Learn to believe that Christ was given, not for picayune and imaginary transgressions, but for mountainous sins; not for one or two, but for all; not for sins that can be discarded, but for sins that are stubbornly ingrained.
Practice this knowledge and fortify yourself against despair, particularly in the last hour, when the memory of past sins assails the conscience. Say with confidence:
Christ, the Son of God, was given not for the righteous, but for sinners. If I had no sin I should not need Christ. No, Satan, you cannot delude me into thinking I am holy. The truth is, I am all sin.
My sins are not imaginary transgressions, but sins against the first table, unbelief, doubt, despair, contempt, hatred, ignorance of God, ingratitude towards Him, misuse of His name, neglect of His Word, etc.; and sins against the second table, dishonor of parents, disobedience of government, coveting of another's possessions, etc. Granted that I have not committed murder, adultery, theft, and similar sins in deed, nevertheless I have committed them in the heart, and therefore I am a transgressor of all the commandments of God.
Because my transgressions are multiplied and my own efforts at self-justification rather a hindrance than a furtherance, therefore Christ the Son of God gave Himself into death for my sins.
To believe this is to have eternal life. [Martin Luther, A Commentary on St. Paul's Epistle to the Galatians]
Christmas is the time of year we remember the birth of Christ who died for our sins. Without Christ there would be no Christmas. Without Christ there would be no freedom from sin.