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Jbug, as a matter of fact, Jesus did not come to eliminate the Law, as he declared himself that he came to fulfill it and make sure that we all his correligionary Jews were liable to do the same. Read Matthew 5:17-19; but as you present the allegory of the widow who got free of the law with the death of her husband, you agree with the rest of the Christian world that Jesus abolished the Law with his fulfilment of it, according to Paul in Ephesians 2:15, which constitutes Replacement Theology.
The Law was NOT abolished. It was satisfied in the respect that because God came to earth in the flesh, as manifested in the person Jesus Christ, and was put to death, the put away bride was enabled to overcome the point of law that otherwise would have forever barred her husband from receiving her as a bride again.
Where Christians have gone wrong, and were I most definitely do not join in with them, is only those who have their spirit in harmony with the Law of God and who wish to enter into covenant with Him again, according to the terms of His Laws, are allowed to be received into a new covenant. Christianity does not actually offer that covenant in fulfillment. Christianity merely represents a futuristic view of preparing for the time ahead when that new covenant would be available, which most assuredly shall be made according to law. The 'Good News' of the Gospel is that the penalty for our sins was mediated for us by way of Jesus doing what He did. His death was one essential aspect of what the law requires before we could be rejoined to God in a covenantal relationship.
This won't happen until after all of the terms of our punishment are fulfilled, which is the parts Jesus indicated were yet to come to pass. This is what Paul understood. He knew the entire landscape and that the time would come when the scattered people of the northern kingdom would be gathered back together again and given what was promised to them in their resurrection.
However, he knew that when they came forth in their resurrection they brought with them their former adultery, etc. and that the consequences of this would be a period of great apostasy and deception that God the Father would come in the midst of it all and have to personally put an end to it when it had served is purpose. See 2 Thessalonians 2. The apostasy of which he speaks is standing at the time when Jesus returns, which means there had to be a restoration of things not too long prior to this falling away. This is why yet another has to come and make a restitution of all things to prepare the way for the Father to sit upon His throne over the Kingdom in victory.
Paul also seemed to understand that the people of the southern kingdom were to be given the same cup as those of the northern kingdom. The people of the southern kingdom have been gathered back to their lands, just as the covenant terms promise. Only in their case they were gathered once before and then scattered again when they were given Aholah's cup (at Masada). And, since they have Aholah's cup, they shall be gathered again but they shall be given over into the hand of their enemy. Thus, the State of Israel shall become a world headquarters for their adversary and not their God. Well, in truth, it is their God acting in the capacity as their adversary. Only the wise shall understand this. God said if ye walk contrary to Him that He shall walk contrary to you. That is what is happening right now. See Leviticus 26.
And Jesus did not establish any new covenant, because when he came, he was already under the New Covenant predicted by Jeremiah in 31:31.
I agree He didn't establish a new covenant. He understood that the Kingdom would not come in victory until the 'world to come'. Your timing for the New Covenant only pertained to the southern kingdom since their period of punishment was much shorter than the northern kingdoms period of judgment. However, they apostatized and were stoned to death as an adulteress again when they were handed their sister Aholah's cup. They too were destined to wait in accordance to the people of the northern kingdoms timeline to be able to be received into a new covenant that would be fully eligible.
And according to this New Covenant, no one is supposed to die for the iniquities of another. Every one is supposed to die for his own iniquity. (Jer. 31:30) Therefore, Jesus was crucified on political charges for being proclaimed king of the Jews.
Jesus died in order to fulfill the law so that the people of Israel could become eligible to be received into covenant with God again. The law required it. If you say otherwise then you don't understand the law or you are willfully doing what you accuse the Christians of doing.
God and Israel had been husband and bride all right. But because Judah of the time of Ahaz had rejected God's Covenant to establish one with Assyria, they had rejected God's Covenant and doomed themselves to the fate of Ephraim. But because of God's promise to David that his Tribe would remain forever as a Lamp in Jerusalem, the judgment which was supposed to fall on Judah, lighted upon Israel as the redeemer of Judah. (Isa. 9:8; Psalm 78;67-69; and I Kings 11:36) So, the annual prophecy of the Scapegoat taking the sins of Judah to the East desert of Judah towards Assyria was fulfilled in Ephraim.
This is wishful thinking. I have looked over the passages you cite here and they do not explicitly establish what you are trying to establish. Not only that, your manner of understanding them is blatantly in contradiction with many other prophesies of the restoration of all 12 tribes of Israel, not just yours. It is you who teaches a silly "replacement theology" that has Israel being lost forever so that Judah would be spared forever. No such replacement ever took place. Judah was given Israel's "cup" to drink deep and wide from and it certainly is doing so right now. She is on the brink of being fully overcome by the hand of her enemy, right on schedule.
Also, the promise through David was NOT to David's tribe. It was to David's own posterity. It is entirely feasible, and required for other prophecies to have their fulfillment, that two individuals who have the seed of David in them, but who are of the tribe of Ephraim and Joseph respectively, shall be the promised advents of Messiah that are foretold. Ephraim being the one that is killed physically and spiritually in consequence of being the ringleader in the ancient northern kingdom's apostasy (adultery). Thus, Ephraim as a tribe is blotted out and suffers the consequences of that as laid out in Deuteronomy 29:18-29. Ephraim is currently manifesting as the USA right now in order to have this consequence play out. However, as God promises, He shall not make a complete and utter annihilation of Ephraim. In His wisdom and foreknowledge, he established things such that those of Ephraim who repent fully can claim their standing in Israel by way of the provisions for Joseph's tribe. Joseph's tribe was not replaced by Ephraim or Manasseh's tribes. Rather, he retained a tribe with the terms being (paraphrasing) "whoso of thy seed not belonging to these two tribes shall be thine". So, when Ephraim's tribe is blotted out, they are yet of Joseph's seed and now they are not of Ephraim's tribe. Thus, they are eligible to stand in Joseph's tribe. However, they actually have to understand these things, as well as understand their own apostasy, to know to do this.
Anyway, I actually get the sense I am more or less just thinking out loud here. It's not very likely I have developed this material above sufficiently well for the average Bible student to make good use of. So, I'll shush.