And the Jewish nation decended from to Abram (Abraham)who came out of Amorites and Hittite nations, enemies of Christ. In order to form one new Christian nation out of many nations in respect to the spiritual incorruptible seed of Christ. The same seed passed on to Jacob ending at the birth of Christ. And not many seeds in respect to the flesh (Abraham), not all Israel is Israel as in the same way not all Christians who claim they are, are.
If any man has not the Spirit of Christ in respect to the seed of Christ they simply do not belong to Him
Ezekiel 16:3 And say, Thus saith the Lord GOD unto Jerusalem; Thy birth and thy nativity is of the land of Canaan; thy father was an Amorite, and thy mother an Hittite.
Galatians 3:16 Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.