You hadn’t heard that God abandoned Israel for a time when they denied Christ and accepted His blood on their hands?
Paul says they had a hardening in part.
Rom 11:25 I do not want you to be ignorant of this mystery, brothers, so that you may not be conceited: Israel has experienced a hardening in part until the full number of the Gentiles has come in.
There was a reason God abandoned them for a period.
Rom 11:11-12 "Again I ask: Did they (nation of Israel) stumble so as to fall beyond recovery? Not at all! Rather, because of their transgression, salvation has come to the Gentiles to make Israel envious. But if their transgression means riches for the world, and their loss means riches for the Gentiles, how much greater riches will their fullness bring!
Notice the end of verse 12. “how much greater riches will their fullness bring! As is shown in Isaiah 54, and other places, their restoration will be greater than any time before.
God didn’t abandon them forever.
Rom 11:28 As far as the gospel is concerned, they (nation of Israel) are enemies on your account; but as far as election is concerned, they (nation of Israel) are loved on account of the patriarchs, for God’s gifts and his call are irrevocable.
Then where is the bill of her divorcement?