A “hardening in part” has come to Israel. It’s part of the drama that the Lord has arranged for the souls of humanity to carry out.
Christians ought to be careful too. It’s possible to live a simulacrum of that faith out in a manner that isn’t spiritually and morally different from Pharisaism, a well camouflaged self centeredness. I’ve beat my head against many sad examples in almost 3 decades of being born again, perhaps learning even more lessons than I have imparted to others. The greatest gifts of the Lord are not presented except to hearts of faith, not in self but in the Lord.
Romans 11:25-26
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. 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:
Christians will have to give an account of how they treated Israel (Jews) too.