I really don't understand why so many brethren struggle with understanding what Paul said in Romans 11 about all Israel being saved. And Paul was literally speaking of His brethren Israelites born of the seed of Israel.
In that Romans 11 Chapter, Paul made it clear that the reason why so many Jews reject Jesus is because of the 'spirit of slumber' God placed upon them so The Gospel would go to the Gentiles. So God Himself blinded them away from The Gospel.
So let me ask this. If God Himself blinded them away... from The Gospel, then did they make the choice to reject Lord Jesus, and are they accountable in that blinded state? NO, which basically is what Paul is showing in the later Romans 11:25-30 verses.
Rom 11:23
23 And they also, if they abide not still in unbelief, shall be graffed in: for God is able to graff them in again.
KJV
ONLY once their blindness is removed... will they have their opportunity to either accept Jesus or reject Him. And that time for most of the Jews won't come until the 'fulness of the Gentiles' comes in according to Paul, which means the day of Christ's future return.
Rom 11:25-29
25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.
26 And so all Israel shall be saved: as it is written, 'There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob:
27 For this is My covenant unto them, when I shall take away their sins.'
28 As concerning the gospel, they are enemies for your sakes: but as touching the election, they are beloved for the fathers' sakes.
29 For the gifts and calling of God are without repentance.
KJV
Thus we cannot really say at this time the unbelieving Jews are condemned already. We do not yet know who among them will believe on Jesus Christ once their blindness is removed in the future at Christ's coming. This is why Apostle Paul told us to not be conceited because we already have believed on Jesus Christ.
The spirit of slumber given the Jews, eyes they could not see, ears they could not hear is no different then all of unbelieving humankind. You're forgetting about the election of God.
Romans 11:7-8 (KJV) What then?
Israel hath not obtained that which he seeketh for; but the election hath obtained it, and the rest were blinded (According as it is written, God hath given them the spirit of slumber, eyes that they should not see, and ears that they should not hear
unto this day.
Paul begins by telling us that God has not cast away His people which He foreknew. Paul says remember I too am an Israelite, of the seed of Abraham, of the tribe of Benjamin. So even with the spirit of slumber it is plain to see that God will save His people. Just as in the days of Elijah when God reserved 7000 men who had not bowed to Baal, so too in the days of Paul God had reserved a remnant according to election of grace. Salvation has always been by grace through faith, and is not according to man's will, but God's will.
Apart from the grace of God, all of humanity stands condemned to death from the fall. Had God not chosen to save some people according to election of grace, then no people would be saved. Remember the words of Paul from Ro 3
"there are none righteous, no, not one: There is none that understands, there is none that seeks after God."
The natural Jew, or Jew according to the flesh, like all of humanity walked in their own way before the advent of Christ. But since Christ has come, all men are called to repent and believe the Gospel.
Acts 14:15-16 (KJV) And saying, Sirs, why do ye these things? We also are men of like passions with you, and preach unto you that ye should turn from these vanities unto the living God, which made heaven, and earth, and the sea, and all things that are therein:
Who in times past suffered all nations to walk in their own ways.
Acts 17:30-31 (KJV) And
the times of this ignorance God winked at; but now commandeth all men every where to repent: Because he hath appointed a day, in the which he will judge the world in righteousness by that man whom he hath ordained; whereof he hath given assurance unto all
men, in that he hath raised him from the dead.
Today is the day of salvation! Today, in this age we are all called to repent and believe Christ, turn to Him to be saved. This call for repentance and belief is for natural Jews as well as Gentiles, for since Christ came there is no difference. There is now only those of faith, and those of unbelief. The Gospel, or message of Christ's life, death and resurrection is freely given to all humankind, so that none have excuse. None can say, but God has blinded me so I cannot hear or see. God uses His Gospel of Christ to save His people, and whosoever is ordained unto eternal life will be saved.
Acts 13:45-49 (KJV) But when the
Jews saw the multitudes, they were filled with envy, and spake against those things which were spoken by Paul, contradicting and blaspheming. Then Paul and Barnabas waxed bold, and said,
It was necessary that the word of God should first have been spoken to you: but seeing ye put it from you, and judge yourselves unworthy of everlasting life, lo, we turn to the Gentiles. For so hath the Lord commanded us, saying, I have set thee to be a light of the Gentiles, that thou shouldest be for salvation unto the ends of the earth. And when the Gentiles heard this, they were glad, and glorified the word of the Lord: and as many as were ordained to eternal life believed. And the word of the Lord was published throughout all the region.
When Paul says "all Israel shall be saved" he is not speaking of natural, ethnic people, but the people of God, the Israel of God, where there is no difference what nation one is from. For in Christ there is only one people, who are neither Jew nor Gentile, but Christians. When Gentiles are grafted into Christ by grace through faith with Israelites of faith is how "all Israel" shall be saved.
Galatians 6:15-16 (KJV) For
in Christ Jesus neither circumcision availeth any thing, nor uncircumcision, but a new creature. And as many as walk according to this rule, peace
be on them, and mercy, and upon
the Israel of God.