“They will return to the faith of their father Abraham” —> TC, can you clarify what you mean by this? I think the Jews are following the faith of their father Abraham, just that they have not acknowledged the Messiah.
Here’s a shocking statement for most modern western Christians: Abraham was Trinitarian. Abraham trusted in Jesus Christ, the divine second person, for his salvation. We have Christ’s own testimony to that effect:
56 Your father Abraham rejoiced to see My day, and he saw it and was glad."Abraham saw Christ and rejoiced. Abraham wasn’t some bland monotheist who believed in some unnamed (possibly human-ony) messiah; he believed in Jesus Christ, the second person of the holy Trinity, the God-man who entered history to save His people from their sins. The faith of Abraham was a Trinitarian faith.
57 Then the Jews said to Him, "You are not yet fifty years old, and have You seen Abraham?"
58 Jesus said to them, "Most assuredly, I say to you, before Abraham was, I AM." (John 8)
This is why Paul tells us in Galatians 3 that those who believe in Christ are the true children of Abraham.
And if you are Christ's, then you are Abraham's seed, and heirs according to the promise. (Gal. 3:29)It’s a sad thing to say, but based on the NT testimony, unbelieving Jews are not practicing the faith of Abraham.