So Israel, the descendants of the twelve tribes of Israel, are real, but their founding father, Jacob/Israel, is not real. That makes a lot of sense!
In Luke 24:26 Jesus says to two disciples on the road to Emmaus, 'Ought not Christ to have suffered these things, and to enter into his glory? And beginning at Moses and all the prophets, he [Jesus] expounded unto them in all the scriptures the things concerning himself.'
It doesn't sound to me like Jesus was expounding to the disciples about the nation of Israel. No, he was expounding to the disciples about the Messiah, the Christ of scripture. Belief is such a suffering Christ was widely accepted in the first century amongst the Jews. They understood Isaiah 53, Psalm 16, Psalm 22, Psalm 69, Psalm 88, Psalm 110, Psalm 118, Psalm 132 as the suffering of an individual, not a just of a nation. The question we ought to be asking is 'Why is it that these traditional beliefs have been superseded by a revisionist agenda?'. The 'suffering servant' is both the Messiah and his people.
Now, you might argue that Jesus was lying, and that he was deceiving the disciples by making the scriptures apply to himself. But that's hard to argue, given that the conversation with these two disciples took place after the crucifixion. The disciples had been discussing the crucifixion when the resurrected Lord Jesus appeared alongside them. He was opening their understanding to the fact that prophecies had just been fulfilled at the crucifixion.