As the Son of Abraham:

The genealogy of Jesus in Matthew is traced, not from Adam, as in Luke's gospel which emphasizes the Lord's perfect humanity, but from Abraham who was sovereignly chosen and separated by God to be the recipient of the promises of God. Those promises looked forward to Christ. "And in thy seed shall all the nations of the earth be blessed." Gen. 22:18. The Jews boasted that Abraham was their father, but John the Baptist reemphasized the truth of God's sovereign election by telling them "that God is able of these stones to raise up children unto Abraham." Matt. 3:9. God could sovereignly call the Gentile just as He had called Abraham. Man's blessing is not determined by human relationship or natural ability, but by the call of God. Man cannot earn, nor is he entitled to the blessing of God. If we are to be eternally blessed, we must first come to God as those that need a Savior.