The question “what about the Jew” is frighteningly important in it’s historic context. Paul immediately impresses upon the reader how important his kinsmen according to the flesh are since it directly impacts God’s good word.
Paul’s not referring to only blood relatives although he makes the blood relation with his countrymen that important. These are the Israelites who were formed as a nation by the very word of God. This group finds its origins in Abram, who was called out from the Gentiles, crossed over the river into Canaan and traveled up and down throughout the land. God gave irrefutable promises to Abraham and eventually to his sons…setting them apart children of promise.