In Genesis 12: 1 – 3 we read: “Now the Lord had said unto Abram, Get thee out of thy country, and from thy kindred, and from thy father’s house, unto a land that I will shew thee: And I will make of thee a great nation, and I will bless thee, and make thy name great; and thou shalt be a blessing: And I will bless them that bless thee, and curse him that curseth thee: and in thee shall all families of the earth be blessed.” In this passage God promised Abraham that he would be the father of a great nation (Israel), and all other nations would be blessed from Israel. Galatians 3:14 tells us: “That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith.”
Galatians 3:6-8 states, “Even as Abraham believed God, and it was accounted to him for righteousness. Know ye therefore that they which are of faith, the same are the children of Abraham. And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, saying, In thee shall all nations be blessed.”
And Galatians 3:29 states: “And if ye be Christ’s, then are ye Abraham’s seed, and heirs according to the promise.”
As believers we become spiritual descendants of Abraham, not physical Israelite’s.