All Israel will be saved doesn't mean every individual Jew. These are highly debated verses.
There are some that believe that phrase means that one day the nation of Israel itself will be re-instituted and every member thereof will be a believer in God through Jesus...Others believe that this verse simply states that God will continue to deal with the people of Israel generation after generation
and that once we have gotten to the end of time we will look back and we will see this great cumulative work that God has done amongst His people... and some just think it means all the true church will be saved. So you need to state your position.
I take notice that it seems with this verse you are open and even acknowledge that "all" does not mean each and every individual Jew.
I will say this: Paul is asserting here that all Jewish people who embrace Christ by faith will be engrafted into the body of Christ.
And he does not downplay the necessity of faith. They will be grafted in for God is able to graft them in again, when they are willing to respond to him. I don't believe this is some kind of prophecy about when that happens, so I think you are misusing the verse.
That's not the issue under discussion. The issue is whether the fullness of the Gentiles has already come in or not yet, or if all Israel had already been saved. For this will settle the matter of the hardening of "the rest" of Israel, whether it had already ended or it still remains. But as you said, you don't know. And so, it is for you, which leaves you somewhat at a lost regarding that matter.
I take knowledge of the mystery which Paul had just revealed therein, that blindness in part has happened to Israel. What is the meaning of this blindness in part? It means that Israel, as a people, as a whole, are blinded to the truth that Jesus Christ as the promised Messiah spoken and prophesied about in the Holy Scriptures, and so they reject the gospel. Why has this happened? According to Paul, taking reference in the OT scriptures, it is because God has given Israel a spirit of stupor, eyes that they should not see, and ears that they should not hear (v.8). It is in part, in the sense that God had reserved for Himself, just as He had in past generations of Israel (v.4), a remnant according to the election of grace (v.5), whom He did not harden or blinded (v.7), and whom He saved. Paul said that this hardening and blinding of Israel shall be until the fullness of the Gentiles has come in (v.25). Has this happened yet? Paul gave us a sign that we may know when such had taken place. He said in verse 26, that when that happens, all Israel will be saved. Now, I don't believe that such had already happened simply because, to this very day, it cannot be said that Israel, as a people, as a whole, are saved, that is, believes the gospel of Jesus Christ.
As such then, Israel, to this day, remains in the state of blindness, saved a few, a remnant according to the election of grace.
Tong
R0596