The New Testament is largely mute on the question of Jesus' origins. Just two canonical gospels share infancy narratives, and Paul says nothing about a birth. The Gospel of John doesn't have an infancy narrative per se, but he does declare that the Word of God became flesh and dwelt among us. That seems good enough for me. God became flesh and dwelt among us and we have seen his glory, the glory of father's only son (John 1:14).
So this morning as we contemplate the meaning of Christmas -- that God is somehow present in Jesus, so that we might see in this person of flesh and blood the fullness of deity -- I leave you with a word from Karl Barth, a theologian of the Word.
Thus the reality of Jesus Christ is that God himself in person is actively present in the flesh. God Himself in person is the Subject of a real human being and acting. And just because God is the Subject of it, this being and acting are real. They are genuinely and truly human being and acting. Jesus Christ is not a demigod. He is not an angel. Nor is He an ideal man. He is a man as we are, equal to us as a creature, as a human individual, but also equal to us in the sate and condition into which our disobedience has brought us. And in being what we are He is God's Word. Thus as one of us, yet the one of us who is Himself God's Word in person, He represents God to us and He represents us to God. In this way He is God's revelation to us and our reconciliation with God. (Church Dogmatics The Doctrine of the Word of God, Volume 1, Part 2: The Revelation of God; Holy Scripture: The Proclamation of the Church, 151).The mystery of the incarnation is the revealing of God to the creation in flesh and blood, sharing our existence, feeling our feelings, suffering our pain and anguish, that we might be drawn up into union with God. Yes, the Word of God has become Flesh and Blood and dwelt among us.