nc
There are doctrines in which Scripture does not directly word or phrase their teachings but is disclosed by implication, such as your inquiry.
I agree with some of your comment !
I do not find the Lord's "new testament in My blood" (Luke 22:20) to be exclusive to Israel, as I do concerning "I will make a new covenant with the house of Israel, and with the house of Judah"
Thats your opinion but you have no biblical basis for it, simply because that would make the House of Israel in that passage to mean the physical descendants of Abraham according to the flesh Israel, which are exempt altogether from being the Children of God and Promise to whom the Covenant Promises apply Rom 9:8
8 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.
And the New Covenant Promises to Israel is to the Children / Sons of God Jer 31:33
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.
Heb 8:10
10 For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts:
and I will be to them a God, and they shall be to me a people:
2 Cor 6:14-18 describes the Church as the same ones 2 Cor 6:14-18
14 Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?
15 And what concord hath Christ with Belial? or what part hath he that believeth with an infidel?
16 And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God,
and they shall be my people.
17 Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you.
18 And will be a Father unto you,
and ye shall be my sons and daughters, saith the Lord Almighty.
This totally eliminates the idea that those in Jer 31, Israel is speaking of the Physical descendants of Abraham Israel according to the flesh !