In his sermon this week, John Piper has an exquisitely simple explanation for how Christianity is the logical result of Judaism. He captures this in a single sentence:
It’s through Jesus that God’s promise to Abraham is fulfilled.
Too simple? Piper provides context, with inexorable logic:
God promised Abraham that through his offspring all the families of the earth would be blessed (Genesis 12:3). Then came the narrowing down: Isaac, not Ishmael; Jacob, not Esau; the twelve tribes of Israel, not the nations; the tribe of Judah, not his eleven brothers; David, not Jesse’s other sons.
God chose one, and then one again, and then again, all pointing to his final choice, Jesus Christ, the offspring. It’s through Jesus that God’s promise to Abraham is fulfilled. In Jesus all the familes of the earth are blessed — Arab, Asian, African, American — everyone who calls on the name of the Lord will be saved (Romans 10:13).
Thus are the sons of Ishmael, and everyone else alive on earth for that matter, able to be blessed.
My Calvinist instincts might be prone to raise an argument against Romans 10:13; it is not sufficient to merely call on the name of the Lord. God, from the very beginning of time, has chosen those who will make such a call.
That said, ss Mr Piper concludes, it is up to us to help do the Lord’s work by spreading the Gospel to those who now deny the sons of Abraham, Isaac, Jacob, David, and, the Son of Man, Jesus Christ.