There are far more capable people than I that have studied this out:
https://zondervanacademic.com/blog/bible-contradictions-explained/
Preterism holds that Ancient Israel finds its continuation or fulfillment in the Christian church at the destruction of Jerusalem in AD 70. This is also called "Replacement Theology". The Watchtower has adopted a type of replacement theology where (in their view) Israel's national contract with God that was inaugurated on Mt. Sinai was transferred onto them, the Wt. leaders. Neither view lines up with scripture:
Galatians 3:
For all who rely on the works of the law are under the curse. For it is written, “Cursed is everyone who does not continue in all things which are written in the Book of the Law, to do them.”11 Now it is evident that no man is justified by the law in the sight of God, for “The just shall live by faith.”12 But the law is not of faith, for “The man who does them shall live by them.”13 Christ has redeemed us from the curse of the law by being made a curse for us—as it is written, “Cursed is everyone who hangs on a tree”14 so that the blessing of Abraham might come on the Gentiles through Jesus Christ, that we might receive the promise of the Spirit through faith.
The Law and the Promise
15 Brothers, I am speaking in human terms: Though it is only a man’s covenant, yet if it is ratified, no one annuls or adds to it. 16 Now the promises were made to Abraham and his Seed. He does not say, “and to seeds,” meaning many, but “and to your Seed,”meaning one, who is Christ. 17 And this I say, that the law, which came four hundred and thirty years later, does not annul the covenant that was ratified by God in Christ, so as to nullify the promise. 18 For if the inheritance comes from the law, it no longer comes from the promise. But God gave it to Abraham through a promise.
And Romans 1: 25 - For I do not want you to be ignorant of this mystery, brothers, lest you be wise in your own estimation, for a partial hardening has come upon Israel until the fullness of the Gentiles has come in.
Clearly, the old and new covenants are running concurrently. The former is a national covenant where only the nation of Israel is guaranteed survival. (The modern nation of Israel testifies to its veracity). The new covenant is a personal contract between God and the believer. It is FAR better because it irrevocably guarantees the avoidance of Personal Condemnation for the believer..... because Christ was condemned in our place, suffering our due punishment. God adopts us and takes personal responsibility for our continued existence, training, discipline, and yes ... he often spoils us with many gifts; just as we do with our own children.
We are nearing the close of the Age of Grace (the current dispensation) . God will shortly deal directly with the nation of modern Israel, after the rapture of the christian believers; to restore their belief. As a nation, this time they will treat the King with the proper respect. When they collectively cry out "blessed is he who comes in the name of the Lord", then he will return.
But, it will take global upheaval to get them to do that. But, it is going to happen..... guaranteed. The Return of the King.
One more dispensation to go - The Millennium.
Will be quite a ride.
