For I do not desire, brethren, that you should be ignorant of this mystery, lest you should be wise in your own opinion, that blindness in part has happened to Israel until the fullness of the Gentiles has come in. 26 And so all Israel will be saved, as it is written:
“The Deliverer will come out of Zion,
And He will turn away ungodliness from Jacob;
27 For this is My covenant with them,
When I take away their sins.”
28 Concerning the gospel they are enemies for your sake, but concerning the election they are beloved for the sake of the fathers. 29 For the gifts and the calling of God are irrevocable. 30 For as you were once disobedient to God, yet have now obtained mercy through their disobedience, 31 even so these also have now been disobedient, that through the mercy shown you they also may obtain mercy. 32 For God has committed them all to disobedience, that He might have mercy on all. — Romans 11:25-32.
Although a large majority of Israel opposes the gospel and is blind spiritually, the time will come, after all the Gentiles have been saved that will be saved, physical Israel will be saved. This will be only because they have become God’s people spiritually through God’s mercy and repentant faith in Christ. God’s eternal calling of His people will be completed, but along the way many Gentiles will also be saved.