[af_vet_1981]

Jesus was very big in the Bible on saying that Israel was to be utterly destroyed

No; lack of understanding;

There is a reason the Messiah said:
1. "So the last shall be first, and the first last: for many be called, but few chosen."
2. "For I say unto you, Ye shall not see me henceforth, till ye shall say, Blessed is he that cometh in the name of the Lord."
3. "Heaven and earth shall pass away, but my words shall not pass away."

Jeremiah 31:

31. Behold, the days come, saith the LORD, that I will make a new covenant with the house of Israel, and with the house of Judah:
32. Not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; which my covenant they brake, although I was an husband unto them, saith the LORD:
33. But this shall be the covenant that I will make with the house of Israel; After those days, saith the LORD, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people.
34. And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD; for I will forgive their iniquity, and I will remember their sin no more.
35. Thus saith the LORD, which giveth the sun for a light by day, and the ordinances of the moon and of the stars for a light by night, which divideth the sea when the waves thereof roar; The LORD of hosts is his name:
36. If those ordinances depart from before me, saith the LORD, then the seed of Israel also shall cease from being a nation before me for ever.
37. Thus saith the LORD; If heaven above can be measured, and the foundations of the earth searched out beneath, I will also cast off all the seed of Israel for all that they have done, saith the LORD.

[MNDude]

Perfect verse.

The significance of Jeremiah 31:31 lies in the idea that this “new covenant” will be different from the old one. It is often associated with the idea of spiritual renewal and forgiveness of sins. This passage is foreshadowing the New Testament and the coming of Jesus Christ, who is seen as the embodiment of the new covenant through His teachings, sacrifice, and the concept of salvation through faith.

In Christianity, the new covenant is often associated with the concept of God’s grace and forgiveness offered to humanity through faith in Jesus Christ, replacing the old system of laws and sacrifices.

It is clearly not talking about giving foreign aid to a secular nation in the middle east.

[Philsworld]

A nice summation:

https://www.ministrymagazine.org/archive/1963/07/the-true-israel-of-god

TO WHOM WAS THE KINGDOM GIVEN?
In Romans 3:1, 2 Paul admits that the Jews were a favored people “chiefly, be­cause that unto them were committed the oracles of God,- which is an obvious refer­ence to the twelve tribes at Sinai. It is of these same people that he refers in the words “who are Israelites” in Romans 9: 3-5. These Jews, these Israelites, limited God’s promises to a literal nation, as An­glo-Israelism has done, but the kingdom was taken from them for reasons we may list from New Testament references as follows:

Rom. 2:24. The name of God was blasphemed by Gentiles because of Jewish inconsistency.

Luke 16:1-12. The Jews had completely failed as God’s stewards.

Matt. 21:33-44; Isa. 5:7. They did not bring forth the fruits of God’s king­dom—judgment and righteousness. Paul’s agony over his unrepentant kins­men is clearly seen in Romans 9:3, and in verse 8 he states explicitly: “They which are the children of the flesh, these are not the children of God: but the chil­dren of the promise are counted for the seed.”

The “Jew, which is one outwardly,” says Paul, “is not a Jew. . . . But he is a Jew, which is one inwardly” (Rom. 2:28, 29). That is, any believer who accepts the cov­enant promises is a spiritual Jew or Israel­ite and an inheritor through Abraham, Isaac, Jacob, Jesus. The promise of heir­ship of the world was not for Abraham alone, “but for us also, to whom it shall be imputed, if we believe on him that raised up Jesus our Lord from the dead” (chap. 4:24, 25).

In God’s sight there is now “neither Jew nor Greek . . . : for ye are all one in Christ Jesus. And if ye be Christ’s, then are ye Abraham’s seed, and heirs according to the promise” (Gal. 3:28, 29). Thus it is “that the Gentiles, which followed not after righteousness, have attained to right­eousness, even the righteousness which is of faith” (Rom. 9:30).

The great apostle to the Gentiles gives the reason for the withdrawal of covenant privileges from the people of Israel, or the Jews, and their bestowal on the Gentiles:

“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” (Acts 13:46).

For this reason another apostle spoke of the Gentiles who had entered into cove­nant relation with Christ in these terms:

But ye are a chosen generation, a royal priest­hood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light: which in time past were not a people, but are now the people of God: which had not ob­tained mercy, but now have obtained mercy (1 Peter 2:9, 10).

Paul makes an interesting use of the terms “Jews,” that is literal Israel, “Gen­tiles,” and “the church of God”: “Give none offence, neither to the Jews, nor to the Gentiles, nor to the church of God” (1 Cor. 10:32).

Clearly the kingdom promises were taken from the unbelieving Jewish nation —the church of God in Christ’s day—and given to believing Gentiles and Jews—God’s elect in every nation. To twice-born men, regardless of race, and to them alone, now belong “the adoption, and the glory, and the covenants, . . . and the promises” (Rom. 9:3-5).

The Anglo-American-Israel theory is based on the same fallacy committed by the Jews, or Israel, of Christ’s day. They limit God’s covenant promises and bless­ings to be a literal nation, or nations, whereas they belong to every man in Christ Jesus.