One just has to look at the prophecies about Israel's return to know the answer to this question.This thought has crossed my mind...
I the state of Israel the legitimate Israel, the country of God's chosen people? I ask because the current state celebrates LGBT stuff and supports abortion (among other things). These types of things by kings of the Old Testament got Israel judgement from God. They were driven out of the land for it.
After 2,000 years of exile, the Jewish people have once again returned to the Land of Israel.
Ask any Muslim if they are Jews or not they even know. That is prophecy.
Ezekiel chapter 36 prophecies this.
Ezekiel 37 I believe is talking about the Nazi concentration camps. Remember those pictures? They had lost hope and were as dead, if you looked into their eyes on those horrible pictures. This is my opinion only.
Right after WWII Jews felt lead to go back to the land they had been away from for over 2000 years.
Jeremiah chapter 16
Zachariah chapter 14
They all now speak Hebrew which was not spoken by a nation in around 2000 years.
Zephaniah Chapter 3
The tribulation is about punishing Israel for its unbelief and they will eventually accept Christ toward the end. That is biblical prophecy.
Zechariah Chapters 12 and 13 show that they will eventually turn to the Messiah that they refused all these years.
There is more, this is off the top of my head without going and researching everything out.
To much Bible prophecy being fulfilled to ignore that they are the Jews IMO.