In Romans 9-11, the Apostle says that there will always be some branches in the covenantal Olive Tree that are Jewish, in fulfillment of the covenant with Abraham.
E.g.
I say then, Hath God cast away his people? God forbid. For I also am an Israelite, of the seed of Abraham, of the tribe of Benjamin. God hath not cast away his people which he foreknew. Wot ye not what the scripture saith of Elias? how he maketh intercession to God against Israel saying, Lord, they have killed thy prophets, and digged down thine altars; and I am left alone, and they seek my life. But what saith the answer of God unto him? I have reserved to myself seven thousand men, who have not bowed the knee to the image of Baal. Even so then at this present time also there is a remnant according to the election of grace. (Rom 11:1-5)
blindness in part is happened to Israel (Rom 11:25)
As concerning the gospel, they are enemies for your sakes: but as touching the election, they are beloved for the father's sakes. For the gifts and calling of God are without repentance. (Rom 11:28-29)
Alongside these branches the Gentiles are engrafted and have spiritual equality with the Jews in "the Israel of God" (Gal 6:16)
The Land was never unconditionally given to the Jews but depended on them producing good works by grace through faith, otherwise they could be expelled for a time (e.g. Deut 28) The dimensions given to the Israelites by God were also sometimes smaller and sometimes larger, meaning that it was but a part and token of a larger inheritance.
In the New Testament period, the Church/Israel of God, is not promised unconditional progress, either, although all the elect will be saved. The candlestick can be removed from a certain place for a time, maybe a long time e.g. Revelation 2:5.
Abraham and his true offspring, both Jewish and Gentile, inherit not only the Land but also the rest of the world too.
E.g.
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.(Rom 4:13)
Blessed are the meek: for they shall inherit the earth.(Matt 5:5)
The Land of Israel (Palestine or whatever one would like to call it) no longer has the typological significance it had under the period from Moses to Christ, but has historical significance for Christians and for Jews, and also for some Arabs. If God in His providence wishes some Jewish people to settle there - including some believing Jewish people who are part of the Israel of God - that is in His providence, and they will have to find a way of getting on with the Gentiles who live there, including some Gentiles who are part of the Israel of God.
The Apostle does not indicate that the return to the Land is of any spiritual significance, but that the conversion of Israel after the flesh to Christ is, whether the Jews live in Tel Aviv or Timbuctu.
All nations, including Israel after the flesh, are to be incorporated into the Israel of God, the Church, a trans-national and trans-historical people, which is to inherit the earth, including the OT territory, together.
That process will only be partially and imperfectly accomplished before the Eschaton.
Calvin on Romans 4:13
That he should be the heir of the world, etc. Since he now speaks of eternal salvation, the Apostle seems to have somewhat unseasonably led his readers to the world; but he includes generally under this word world, the restoration which was expected through Christ. The chief thing was indeed the restoration of life; it was yet necessary that the fallen state of the whole world should be repaired. The Apostle, in Hebrews 1:2, calls Christ the heir of all the good things of God; for the adoption which we obtain through his favor restores to us the possession of the inheritance which we lost in Adam; and as under the type of the land of Canaan, not only the hope of a heavenly life was exhibited to Abraham, but also the full and complete blessing of God, the Apostle rightly teaches us, that the dominion of the world was promised to him. Some taste of this the godly have in the present life; for how much soever they may at times be oppressed with want, yet as they partake with a peaceable conscience of those things which God has created for their use, and as they enjoy through his mercy and good-will his earthly benefits no otherwise than as pledges and earnests of eternal life, their poverty does in no degree prevent them from acknowledging heaven, and the earth, and the sea, as their own possessions.
Though the ungodly swallow up the riches of the world, they can yet call nothing as their own; but they rather snatch them as it were by stealth; for they possess them under the curse of God. It is indeed a great comfort to the godly in their poverty, that though they fare slenderly, they yet steal nothing of what belongs to another, but receive their lawful allowance from the hand of their celestial Father, until they enter on the full possession of their inheritance, when all creatures shall be made subservient to their glory; for both heaven and earth shall be renewed for this end, — that according to their measure they may contribute to render glorious the kingdom of God.
The eighth day is a pointer to resurrection and the new creation and was fulfilled by our Lord's rising on that day and in the Christian Sabbath.
In ceremonial connection with circumcision, it maybe pointing to a spiritual fresh start, and renewal, since the eighth day commenced a new week for the child, but there are also the practical considerations mentioned (?)
Now that the new creation has commenced and we have baptism it is not important that this be conducted on the eighth day after birth, although the Lord's Day is in a real sense "the eighth day", and many (most?) baptisms take place on the Lord's Day. (?)
