Any understanding of Israel apart from the Messiah Jesus Christ is flawed. Only by possessing the faith of Abraham and being transformed into a new creation in Christ–that is, becoming one with Christ–can a person be considered a member of Israel.
Regardless of racial or ethnic background, no one can rightly claim citizenship in/of Israel without first bowing the knee to Israel’s legitimate King, the Lord Jesus Christ, “the son of David, the son of Abraham” (Matt.1:1) ~ Basile Sakkas: The Orthodox Faith
“Understand, then, that those who have faith are children of Abraham. Scripture foresaw that God would justify the Gentiles by faith, and announced the gospel in advance to Abraham: “All nations will be blessed through you.” So those who rely on faith are blessed along with Abraham, the man of faith…… The promises were spoken to Abraham and to his seed. Scripture does not say “and to seeds,” meaning many people, but “and to your seed,” meaning one person, who is Christ”
“So in Christ Jesus you are all children of God through faith, for all of you who were baptized into Christ have clothed yourselves with Christ. There is neither Jew nor Gentile, neither slave nor free, nor is there male and female, for you are all one in Christ Jesus. If you belong to Christ, then you are Abraham’s seed, and heirs according to the promise” – (Galatians 3)
*Also, I encourage you to read Adam’s newest post at Pursuing Truth: “Why I Believe Israel Is the Apple of God’s Eye”