When was a Gentile ever an Israelite?
Hebrews 8:8 "Behold, the days are coming,'' says the Lord, "when I will make a new covenant with the house of Israel and with the house of Judah.
Some very important thing must happen to you if you're a Gentile or else you will be an alien from the commonwealth of Israel and a stranger to the covenant of promise. You will be without God and without hope in the world.
Ephesians 2:11-12 Therefore remember that you, once Gentiles in the flesh who are called Uncircumcision by what is called the Circumcision made in the flesh by hands that at that time you were without Christ, being aliens from the commonwealth of Israel and strangers from the covenants of promise, having no hope and without God in the world.
You, as a Gentile, must be grafted in to the natural branches through the blood of Christ.
Romans 11:11-22 I say then, have they stumbled that they should fall? Certainly not! But through their fall, to provoke them to jealousy, salvation has come to the Gentiles. Now if their fall is riches for the world, and their failure riches for the Gentiles, how much more their fullness! For I speak to you Gentiles; inasmuch as I am an apostle to the Gentiles, I magnify my ministry, if by any means I may provoke to jealousy those who are my flesh and save some of them. For if their being cast away is the reconciling of the world, what will their acceptance be but life from the dead? For if the firstfruit is holy, the lump is also holy; and if the root is holy, so are the branches. And if some of the branches were broken off, and you, being a wild olive tree, were grafted in among them, and with them became a partaker of the root and fatness of the olive tree, do not boast against the branches. But if you boast, remember that you do not support the root, but the root supports you. You will say then, "Branches were broken off that I might be grafted in.'' Well said. Because of unbelief they were broken off, and you stand by faith. Do not be haughty, but fear. For if God did not spare the natural branches, He may not spare you either. Therefore consider the goodness and severity of God: on those who fell, severity; but toward you, goodness, if you continue in His goodness. Otherwise you also will be cut off.
Behold the wondeful work of God, spiritual Israel.