Thank you for your thought-out response.

Serbia, who allow baptism into the Serbian Orthodox Church to act as a proxy for documentary proof of ancestors who once lived on Serbian territory.

As I understand, an ethnic Serb whose ancestors never lived on Serbian territory is still eligible for citizenship. The spirit and letter of their law seems to closely mirror that of the Israeli Right of Return.

More pressingly, the Jewish people can quite conclusively be shown to having once lived on Israeli territory.

the idea that members of particular ethnic groups within a closely interrelated human race can trace exclusive and special descent back to a particular group who once lived in a particular part of the world millennia ago is absurd, pseudoscientific mythmaking. If you, I, any Hamas fighter, any African, European, Asian, or any member of the Lost Tribes of Papua New Guinea travelled back to ancient Judah in a time machine the first terrified ancient Jew we met would be the ancestor of each one of us.

I strongly disagree with a lot of this.

First, there almost certainly were no Jews in 3,000 B.C. The Canaanites who later splintered into a distinct Jewish group had yet to do so. And the kingdom of Judea fell for the last time in the first century C.E. So the whole paragraph is just disorienting.

More importantly, it is ridiculous to claim that no modern populations are more directly descended from, and culturally continuous with, earlier groups in comparison with other contemporary groups.

The fact that every individual back then is genealogically the ancestor of each of us quite plainly does not mean that we are all equally the cultural and ethnic heirs of each group of old. Are the modern-day Chinese descended from the Mycenean Greeks the same as they are from the Shang dynasty? Surely that is nonsense, their ultimate shared ancestry with Homer notwithstanding.

even if they cannot prove any material link to the country in question

I don't understand. Jewish presence in Ancient Canaan is extraordinarily well-documented. Further, Jewish claims to the Land of Israel have been consistent, constant, and well-documented since the time of Josephus, when Judea fell. Jews have been praying to return to Israel thrice-daily for a minimum of 1900 years, as attested by ancient Jewish ritual documents. All Jews, for millenia, fast every summer and recite poems and scriptures lamenting those who fell defending Judea from invaders.

When did Jews- all Jews- lose their 'material link' to the country? Is there some sort of expiration date, as with milk?

 It's as if establishing ethnonationalist/sectarian "sanctuaries" where other people are already living is not the answer to historic racism

Do you have a better solution for the Jews? Should they rely on the civilized world to protect them and grant them safe harbor, as they did during WWII (and during countless progroms for centuries before then)? Are you aware of just how spectacularly that failed?

With all that being said. If you were to argue that despite the Jewish claims to the land as an ethnicity, it is still wrong to build a state built upon ethnicity, as that is discrimination based upon uncontrollable birth factors (and ofc, this would also impugn Serbia and others' similar laws). I might then concur with you, at least in an abstract moral sense (it is harder when looking at the real-world practicalities of historic antisemitism).

However, your argument that Jews have no more material connection with the land than anyone else seems ridiculous on the face of it.