Christmas marks and reminds us of a day a couple millennia ago when the Creator God was born as a helpless human baby. The Creator as creature.
He came as the object of promises made by that Creator God from hundreds and thousands of years before; the birth was the fulfillment of promises and mark the steadfast faithfulness of God. God had not forgotten His people, or the world.
Birthed to live a life as the Life we are made to live. Birthed to live as an example for us; a life of love and acknowledgement of God. Having lived that life, He is destined to die not simply to effect our salvation, but as the ultimate expression of love for you and me; as the ultimate expression of submission to God as an expression of love.
This child reminds us that the world is not foreign to us or to God, but a place to which He deigns to come because He has made it; because He loves it; because He loves you. Loves you and offers you Life with Him.
Two thousand years ago, the beginning of the culmination of God's reconciliation of the world to Himself.