So its through this grafting in the Branches of the Gentiles into Elect Israel, making them also Elect Israel, that's how or in what manner all Elect Israel shall be saved Rom 11:25-26
25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.
26 And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob:
This is the Church, the Body of Christ the Mediator of the New Covenant. 0