"Have this attitude in yourselves which was also in Christ Jesus, who, although He existed in the form of God, did not regard equality with God a thing to be grasped, but emptied Himself, taking the form of a bond-servant, and being made in the likeness of men. Being found in appearance as a man, He humbled Himself by becoming obedient to the point of death, even death on a cross."
The Christmas story is the story of the cross. Jesus was born to give His life on Calvary as a sacrifice for our sins. He willingly died in our place. And because of His sacrifice we may have forgiveness of our sins, a personal relationship with God, and eternal life. But only if we acknowledge our need for a Savior, humbling ourselves and acknowledging our sin. To believe that Christ lived is not enough. The Bible says even the demons believe that. We must receive Him as our Savior and Lord. God's Son -- the perfect sacrifice for our sins.