Romans 2
28A man is not a Jew because he is one outwardly, nor is circumcision only outward and physical. 29No,
a man is a Jew because he is one inwardly, and circumcision is a matter of the heart, by the Spirit, not by the written code. Such a man’s praise does not come from men, but from God.
Romans 9
6It is not as though God’s word has failed.
For not all who are descended from Israel are Israel. 7Nor because they are Abraham’s descendants are they all his children. On the contrary, “Through Isaac your offspring will be reckoned.”a 8So it is not the children of the flesh who are God’s children,
but it is the children of the promise who are regarded as offspring.
Galatians 3
Sons Through Faith in Christ
26You are all sons of God through faith in Christ Jesus. 27For all of you who were baptized into Christ have clothed yourselves with Christ. 28
There is neither Jew nor Greek, slave nor free, male nor female, for you are all one in Christ Jesus. 29
And if you belong to Christ, then you are Abraham’s seed and heirs according to the promise.
Israel is spiritual, all who are in Christ are Gods Israel, we are all the same. (Abraham's seed according to the promise)
Believing Jews are grafted back in.
Romans 11
24For if you were cut from a wild olive tree, and contrary to nature were grafted into one that is cultivated, how much more readily will these, the natural branches, be grafted
into their own olive tree!
During the millennium the saved of all ages, including faithful Jews who lived before the Cross and believing Christians who have lived since then, are all in the heavenly kingdom. Revelation 7:15 speaks of them: "They are before the throne of God, and worship him day and night within his temple." The temple of God is in heaven, not on this earth Revelation 11:19; 15:5. Not until the end of the millennium does the holy city, New Jerusalem, descend from heaven to this earth compare Revelation 21:2 with Revelation 20:7-9. During the millennium the saved of all ages, including those who have passed through the end-time tribulation see Daniel 12:1; Revelation. 7:14, are occupying thrones in the heavenly temple judging lost human beings and angels compare Revelation 20:4 with 1 Corinthians 6:2, 3 .
The idea that the literal nation Israel will be completely restored at the end of history, that during the millennium the Old Testament promises to Israel will be literally fulfilled is an unbiblical teaching. Because the Jews rejected Christ, they lost their chosen nation status, lost the promise that the land of Palestine would be theirs forever, and forfeited their privilege of being the teachers of the Gospel to an unbelieving world. Our Lord bestowed upon His Church in all the world these covenant promises. The land will, indeed, belong to His people, but it will not be limited to Palestine. It will be first the heavenly Canaan during the millennium, followed by the earth made new at the end of the 1,000 years. Jesus said, "Blessed are the meek: for they shall inherit the earth" Matthew. 5:5