In a sense, but a clear look it I can see when Paul refers to Israel, he means the majority of individuals. Look closely. Paul points this out even in the first verse.
11I say then, has God cast away His people (the nation as a whole, individuals who had unbelief, Paul first calls them PEOPLE)? Certainly not! For I (an INDIVIDUAL) also am an Israelite, of the seed of Abraham, of the tribe of Benjamin.
Paul explains God did not cast away His people (Israel, the majority of Israel) because he (Paul, an INDIVIDUAL) was not cast out because later came to faith.
Paul calls the majority of individuals who did not believe "Israel" just for the sake of identification purposes. Can you see that...Paul singles himself out as one who has not been cast out, although he was a true natural Jew. So Paul doesn't mean Israel the Nation, he means the majority of people in the Jewish nation, and calls them Israel because they make up the majority.
If I say United States of America is a sinful nation, does that include you?
Paul brings this out further by talking about Israel's past, the 7000 remnant. Was the 7000 remnant a separate nation? No. But the Majority of people, Israel as a whole, were just about to get judged by God. Was the 7000 included in that Judgement, or were they spared? Yes, the were spared, individually, even though they were still part of Israel the nation.
Can you see now Paul is not talking about the entity, the establishment, but the majority of individuals who had unbelief?
Verse 7 brings this out too!
7 What then? Israel (the majority of people) has not obtained what it seeks; but the elect (Jewish elect, the remnant of the nation, the saved ones, like Paul, the 12 disciples, and all the Jews who didn't reject Jesus, Jewish converts, the Jews at pentecost, etc. etc....The Christian Church at first were all Jews!) have obtained it, and the rest were blinded. (who are the rest? the Jewish majority in whom Paul calls Israel for identification purposes) 8 Just as it is written:
“God has given them a spirit of stupor, (Gentiles aren't even mentioned thus far) so...(God has given the majority of Jews, Israel as a whole, this stupor)
Eyes that they should not see
And ears that they should not hear,
To this very day." (Paul is quoting Isaiah 29:10,13; Deut. 29:3-4, here about Israel as a whole, the majority of individuals about their blindness, it's not about the entity, the establishment because a nation is not a living concept, can't be blind...Only people can be blind...We know this isn't all of Israel individually because we know God had a remnant)
Paul then goes on to quote King David...(ps. 69:22,23) It was Davids' own countrymen after him. David and his countrymen, both Israelites, but a distinction, an individual distinction... Look at what David and Paul says about the majority of Israel who are disobedient "And make their loins shake continually." and "And bow down their back always.” NationalIsrael today is still against Christ, so wonder why there is no peace over there. John said in his book who ever is against Christ is an anti-Christ... (oh boy, can't wait to hear from Straighshooter to shoot me)
“Let their table become a snare and a trap,
A stumbling block and a recompense to them.
10 Let their eyes be darkened, so that they do not see,
And bow down their back always." (Paul is applying this to current national Israel in his day, I think we can make application that it still apply's for today, for Paul said this in our Church age)
You see, Natural Jews will never become God people until they repent and recognized Jesus as their King, LORD, and savior. This is what Paul is bringing out!