Gentiles, by faith, are grafted in among Israel (the Israel of God) as Israelites. It’s not by blood. It never has been. That’s why John the Baptist said in Matthew 3:9: “And think not to say within yourselves, We have Abraham to our father: for I say unto you, that God is able of these stones to raise up children unto Abraham.” Could God raise up children unto Abraham out of stones? Yes.