Romans 9-11 is one of the passages that is often wrested to justify the false claim that Israel has been rejected forever. But this long passage opens with the words that the promises still, even at that time, still pertained to Paul's "brethren," his "countrymen according to the flesh, who are Israelites."
3 For I could wish that I myself were accursed from Christ for my brethren, my countrymen according to the flesh, 4 who are Israelites, to whom pertain the adoption, the glory, the covenants, the giving of the law, the service of God, and the promises; Romans 9:3-4
And near the end of this very long passage we read, even though these people are presently enemies "concerning the gospel," yet they are "beloved for the sake of the fathers." And then we find the absolutely conclusive statement about this question. "For the gifts and calling of God are irrevocable."
28Concerning the gospel they are enemies for your sake, but concerning the election they are beloved for the sake of the fathers. 29For the gifts and the calling of God are irrevocable.
Romans 11:25-29
You are also neglecting the fact that, without even one exception every New Testament passage about the rejection of Israel included an explicit statement that this was temporary, for every one of them, again without a single exception said "until."
Now your doctrine is that both the gifts and calling of this rebellious nation has been revoked. But the Holy Spirit, speaking through the Apostle Paul, has very clearly stated that they are irrevocable. And these irrevocable promises go so far as to even define the borders of the land in that future day, and to specify which part of that clearly defined piece of real estate will go to each of the twelve tribes.
What you are neglecting is that these same Old Testament promises, which you imagine have been revoked, explicitly say that when they are regathered to the land, the rebels will be purged out from among them, and that all the rest will repent with bitter weeping, and thereafter they will all know Him, from the least to the greatest. So these promises do not include, or even imply, that this restoration will include unbelievers.