There are still land promises to be fulfilled and much of the Jewish remnant is yet to be grafted back in.
All believers today become the Church, His Body but no where does it say saved Gentiles become 'Israel'.
The Kingdom still remains promised to Israel. "taken away" and given to another nation' refers to another generation of Jews not to the Church. A similar thing happened to the Israelites in the desert. The land was given to the 2nd generation.
This is part of the conditional Mosaic Covenant and does not apply to the Church today. Christ did fulfill that covenant and nailed it to the cross thus tearing down the barrier and creating one New Man...the Church.
For he is our peace, who hath made both one, and hath broken down the middle wall of partition between us; Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace; And that he might reconcile both unto God in one body by the cross, having slain the enmity thereby:
(Eph 2:14-16)
Point 1: Romans 9:6-8 [SUP]
6 [/SUP]But
it is not as though the word of God has failed.
For they are not all Israel who are descended from Israel;[SUP]7 [/SUP]nor are they all children because they are Abraham’s descendants, but: “
through Isaac (that would be referring to jesus) your descendants will be named.” [SUP]
8 [/SUP]
That is, it is not the children of the flesh who are children of God, but the children of the promise are regarded as descendants.
Gentiles/Christians are the children of the promise! (this extends into your point 2)
Point 2: Romans 11:17-24 [SUP]
17 [/SUP]But if some of the branches were broken off, and you, being a wild olive, were grafted in among them and
became partaker with them of the rich root of the olive tree, [SUP]
18 [/SUP]do not be arrogant toward the branches; but if you are arrogant,
remember that it is not you who supports the root, but the root
supports you.
[SUP]19 [/SUP]You will say then, “Branches were broken off so that I might be grafted in.” [SUP]
20 [/SUP]Quite right, they were broken off for their unbelief, but you stand by your faith. Do not be conceited, but fear; [SUP]
21 [/SUP]for if God did not spare the natural branches, He will not spare you, either. [SUP]
22 [/SUP]Behold then the kindness and severity of God; to those who fell, severity, but to you, God’s kindness, if you continue in His kindness; otherwise you also will be cut off. [SUP]
23 [/SUP]And they also, if they do not continue in their unbelief, will be grafted in, for God is able to graft them in again. [SUP]
24 [/SUP]For if you were cut off from what is by nature a wild olive tree, and were grafted contrary to nature into a cultivated olive tree, how much more will these who are the natural
branches be grafted into their own olive tree?
and
Ephesians 3:1-13 For this reason I, Paul, the prisoner of Christ Jesus for the sake of you Gentiles— [SUP]
2 [/SUP]if indeed you have heard of the stewardship of God’s grace which was given to me for you;
[SUP]3 [/SUP]that by revelation there was made known to me the mystery, as I wrote before in brief.
[SUP]4 [/SUP]By referring to this, when you read you can understand my insight into the mystery of Christ, [SUP]
5 [/SUP]which in other generations was not made known to the sons of men,
as it has now been revealed to His holy apostles and prophets in the Spirit;[SUP]6 [/SUP]to be specific, that the Gentiles are fellow heirs and fellow members of the body, and fellow partakers of the promise in Christ Jesus through the gospel,
[SUP]7 [/SUP]of which I was made a minister, according to the gift of God’s grace which was given to me according to the working of His power. [SUP]
8 [/SUP]To me, the very least of all saints, this grace was given, to preach to the Gentiles the unfathomable riches of Christ, [SUP]
9 [/SUP]and
to bring to light what is the administration of the mystery which for ages has been hidden in God who created all things; [SUP]
10 [/SUP]so that the manifold wisdom of God might now be made known through the church to the rulers and the authorities in the heavenly
places. [SUP]
11 [/SUP]
This was in accordance with the eternal purpose which He carried out in Christ Jesus our Lord,[SUP]
12 [/SUP]in whom we have boldness and confident access through faith in Him. [SUP]
13 [/SUP]Therefore I ask you not to lose heart at my tribulations on your behalf, for they are your glory.
Point 3: Yes, I know that it was part of the Mosaic covenant - I quoted so that it would be read.