The Church is made up of Jews and Gentiles, but it is no longer the Sect of the Nazarenes.
The possibility of total fulfillment of the prophecies concerning Israel (genetic Israel) and the Messiah were "cut off" in 70AD.
A vast number of prophecies are yet unfulfilled and they apply to genetic Israelites.
This is "scriptural".
What is your definition of "vast"? Tens, scores, hundred? Name the vast unfulfilled promises.
All three promises God made to Abraham were fulfilled over 2000 years ago. Israel became a great nation in Egypt, possessed the land under Joshua and Solomon and through Jesus all the nations of the earth were blessed.
Great nation promise:
And he said, I am God, the God of thy father: fear not to go down into Egypt; for I will there make of thee a great nation: (Genesis 46:3)
Fulfilled:
Thy fathers went down into Egypt with threescore and ten persons; and now the LORD thy God hath made thee as the stars of heaven for multitude. (Deut 10:22)
David smote also Hadadezer, the son of Rehob, king of Zobah, as he went to recover his border at the river Euphrates. (2Samuel 8:3)
And Solomon reigned over all kingdoms from the river unto the land of the Philistines, and unto the border of Egypt: they brought presents, and served Solomon all the days of his life. (1Kings 4:21)
And he reigned over all the kings from the river even unto the land of the Philistines, and to the border of Egypt. (2Chronicles 9:26)
Land promise fulfilled:
And
the LORD gave unto Israel all the land which he sware to give unto their fathers; and they possessed it, and dwelt therein. And the LORD gave them rest round about, according to all that he sware unto their fathers: and there stood not a man of all their enemies before them; the LORD delivered all their enemies into their hand.
There failed not ought of any good thing which the LORD had spoken unto the house of Israel; all came to pass. (Joshua 21:43-45)
And, behold, this day I am going the way of all the earth: and ye know in all your hearts and in all your souls, that
not one thing hath failed of all the good things which the LORD your God spake concerning you; all are come to pass unto you, and not one thing hath failed thereof. Therefore it shall come to pass, that as all good things are come upon you, which the LORD your God promised you; so shall the LORD bring upon you all evil things, until he have destroyed you from off this good land which the LORD your God hath given you. (Joshua 23:14-15)
So Joshua let the people depart, every man unto his inheritance. (Joshua 24:28)
And foundest his heart faithful before thee, and madest a covenant with him to give the land of the Canaanites, the Hittites, the Amorites, and the Perizzites, and the Jebusites, and the Girgashites, to give it, I say, to his seed,
and hast performed thy words; for thou art righteous: (Nehemiah 9:8)
Seed promise fulfilled:
And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise. (Gal 3:29)
And we desire that every one of you do shew the same diligence to the full assurance of hope unto the end: That ye be not slothful, but followers of them who through faith and patience inherit the promises. For when God made promise to Abraham, because he could swear by no greater, he sware by himself, Which hope we have as an anchor of the soul, both sure and stedfast, and which entereth into that within the veil; Whither the forerunner is for us entered, even Jesus, made an high priest for ever after the order of Melchisedec. (Heb 6:11-13, 19-20)
And we declare unto you glad tidings, how that the promise which was made unto the fathers, God hath fulfilled the same unto us their children, in that he hath raised up Jesus again; as it is also written in the second psalm, Thou art my Son, this day have I begotten thee... And by him all that believe are justified from all things, from which ye could not be justified by the law of Moses.(Acts 13:32-33, 39)
For the promise, that he should be the heir of the world, was not to Abraham, or to his seed, through the law, but through the righteousness of faith. For if they which are of the law be heirs, faith is made void, and the promise made of none effect: Because the law worketh wrath: for where no law is, there is no transgression. Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all, (As it is written, I have made thee a father of many nations,) before him whom he believed, even God, who quickeneth the dead, and calleth those things which be not as though they were. Who against hope believed in hope, that he might become the father of many nations, according to that which was spoken, So shall thy seed be. (Rom 4:13-18)
Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel: Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called. That is, 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. (Rom 9:6-8)
Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ. And this I say, that the covenant, that was confirmed before of God in Christ, the law, which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect. For if the inheritance be of the law, it is no more of promise: but God gave it to Abraham by promise. Wherefore then serveth the law? It was added because of transgressions, till the seed should come to whom the promise was made; and it was ordained by angels in the hand of a mediator. Now a mediator is not a mediator of one, but God is one. Is the law then against the promises of God? God forbid: for if there had been a law given which could have given life, verily righteousness should have been by the law. But the scripture hath concluded all under sin, that the promise by faith of Jesus Christ might be given to them that believe. But before faith came, we were kept under the law, shut up unto the faith which should afterwards be revealed. Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith. But after that faith is come, we are no longer under a schoolmaster. For ye are all the children of God by faith in Christ Jesus. (Gal 3:16-26)