The birth of Jesus was literally Divine Intervention on behalf of mankind. While the presence of God has always been displayed through Creation, and while God's Hand is stamped within the DNA of peoples' lives (Romans 2:14-15), Christmas, and the message of the Gospel, represents God's desire to restore a relationship with all who choose to receive Him.
He has opened the door for a relationship in which he calls us His children, and He invites us to call Him our Father. God promises to walk with us, and he invites us to walk and talk with Him through whatever life brings our way. There is great comfort in knowing that we are connected to a God whose is able to do more than we can ask or think; a God who is far beyond our understanding, yet is mindful of us as His children.