Yuyutsu

#Before around 800AD, there were neither Muslims nor Jews in existence: their respective ancestors were #Judeans#.

Judeans ARE Jews, and always were. Yours is a pedantic argument; but everyone living in Judea was not a Jew of course. Jews who were, identified as such.

#Some Judeans migrated to Europe and some remained in Israel.#

There were always coming and goings over millennia.
You failed to mention the migration into Modern day Iran. Parthian Empire. That was politically significant during Rebellion against Rome over a couple of Centuries.

http://www.bu.edu/mzank/Jerusalem/p/period2-2-1.htm

This publication does a job on the ancient history of the Jews.
Read it, and get back to me.
The Roman Empire period was the moulding of the Jews towards modernity as like the rest of the West, it was a part of the Roman Empire. Significant.

Fear not, the Jews will be around awhile yet to come, I feel confident with that statement.
I wonder will they outlive Christianity and Islam.
I think Islam will eventually burn itself out; it’s anti Human.

Dear Dan,

I obviously omitted many details, so that I can concentrate on a point, otherwise I would have had to write a whole book here.

There have always been Judeans and Jews coming in and out of Israel, even when at times it was only a trickle.

Of those Judeans that remained in the land of Israel throughout, only one family became and remained Jewish (the Zinati family in the village of Peki'in) - the rest ended up Muslim.

If one is to believe in perpetual tribal land-ownership (I don't), then it would not be genuine to consider the land to belong only to those of the tribe who adopted one religion/culture and disinherit those who adopted another.

You seem to place great importance on the Roman Empire period, yet Judeans first encountered the Western "modern" world even before the Romans, when they were under Greek/Hellenic occupation, against which they also rebelled.

I honestly cannot predict which of the three - Judaism, Christianity and Islam, will outlast the others. That greatly depends on their ability to reform, adjust and remain relevant - and indeed, none of the three is monolithic: all three presently have new and more humane shoots.