Let's finish one topic at a time.
When you read Hebrews 8:8 and Jeremiah 31:31, do you believe what it says literally?
If you want to place yourself under the New Covenant, it means you consider yourself as belonging to the House of Israel and Judah as well.
Is that what you believe in?
Alright, so you think you belong to Israel.
When you encounter other people who do not think like you, why do you consider them as following a false belief?
Much of the entire Brit Hadashah is written so as to drive the disciple into the supernal and spiritual Way of Meshiah which he delivered to his Apostles. This is the real problem with hyper-dispensationalism and reading-understanding all things in the scripture as natural, outward, and physical in meaning. For the same reason the hyper-dispensationalist cannot see many prophecies that have actually already been fulfilled and erroneously place them in the distant unforeseen future.
Example:
Ezekiel 37:15-24 KJV
15 The word of the LORD came again unto me, saying,
16 Moreover, thou son of man, take thee one stick, and write upon it, For Judah, and for the children of Israel his companions: then take another stick, and write upon it, For Joseph, the stick of Ephraim, and for all the house of Israel his companions:
17 And join them one to another into one stick; and they shall become one in thine hand.
18 And when the children of thy people shall speak unto thee, saying, Wilt thou not shew us what thou meanest by these?
19 Say unto them, Thus saith the Lord GOD; Behold, I will take the stick of Joseph, which is in the hand of Ephraim, and the tribes of Israel his fellows, and will put them with him, even with the stick of Judah, and make them one stick, and they shall be one in mine hand.
20 And the sticks whereon thou writest shall be in thine hand before their eyes.
21 And say unto them, Thus saith the Lord GOD; Behold, I will take the children of Israel from among the heathen, whither they be gone, and will gather them on every side, and bring them into their own land:
22 And I will make them one nation in the land upon the mountains of Israel; and one king shall be king to them all: and they shall be no more two nations, neither shall they be divided into two kingdoms any more at all:
23 Neither shall they defile themselves any more with their idols, nor with their detestable things, nor with any of their transgressions: but I will save them out of all their dwellingplaces, wherein they have sinned, and will cleanse them: so shall they be my people, and I will be their God.
24 And David my servant shall be king over them; and they all shall have one shepherd: they shall also walk in my judgments, and observe my statutes, and do them.
There is really only one thing that keeps people from seeing that the above is fulfilled, and that is the rendering of the name David, which actually means Beloved, and the text may be read to say more correctly, even as a pun, "My servant, the Beloved", meaning the Meshiah, ("Son of David" also being one of his titles).
Paul agrees with this understanding and expounds it in the following passage.
Ephesians 2:11-22 KJV
11 Wherefore remember, that ye being in time past Gentiles in the flesh, who are called Uncircumcision by that which is called the Circumcision in the flesh made by hands;
12 That at that time ye were without Christ,
being aliens from the commonwealth of Israel,
and strangers from the covenants of promise,
having no hope,
and without God in the world:
13
But now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ.
14 For he is our peace,
who hath made both one, and hath broken down the middle wall of partition between us;
15 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;
16
And that he might reconcile both unto God in one body by the cross, having slain the enmity thereby:
17
And came and preached peace to you which were afar off,
and to them that were nigh.
18
For through him we both have access by one Spirit unto the Father.
19
Now therefore ye are no more strangers and foreigners,
but fellowcitizens with the saints,
and of the household of God;
20 And are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone;
21 In whom all the building fitly framed together groweth unto an holy temple in the Lord:
22 In whom ye also are builded together for an habitation of God through the Spirit.
This is the joining of the two sticks in Ezekiel 37, Yoseph-Ephraim, which is the house of Yisrael, and the house of Yhudah, for the ten northern tribes, (Yisrael), were scattered among the nations, and thus, the nations or gentiles who believe are counted as the house of Yisrael being drawn out of the nations. However this is not about physical land or physical things.
The olive tree of the Father is His own: He is the Planter and Tender of His beloved family tree, and He can graft as many branches into His tree as He so desires. Therefore neither is this "replacement theology", that phrase dispy's so often use against those believing these things from the scripture, although there is indeed a version of replacement theology that is practiced and is erroneous: for the gentiles are expected to be grafted in and to join Yisrael and Yhudah, not the other way around.