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What he's saying is that the majority of Jews have moved on from the old ways, are not recognizable by wearing particular garb or adhering to strict religious law and observance.
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The point is, one would have to make an effort to search for and find out who the secular Jews were because on virtually any level there was nothing to set them apart from their neighbors and countrymen.
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Thank you, that was exactly my point. And equally important, they were not organized as a people, force, subversive society or whatever anti-semites liked to fantasize about (and some apparently still do).
When Theodor Herzl came up with his idea for a Jewish state in the 1890s, assimilated Western European Jews considered him a gadfly; he found an audience mostly in Eastern Europe, where Jews had been segregated and persecuted as described above.
In Germany, it would actually be better to talk about Germans of Jewish origin than German Jews, so unnoticable were most of them. They were easily identified only because German laws required all citizens to register locally, including by religion. Otherwise, the whole perverted chase after half-Jews, quarter-Jews, etc. would never have been possible. My grandfathers, both in public service, had to document their Aryan descent into the 1800s to keep their jobs.
For the Nazi's purpose, the whole thing with the yellow star (invented in the Middle Ages), with forcing all Jews to take the middle names Israel or Sarah, and stamping a big J on the identity card everyone had to carry, served to create a common group identity, to provide a target, which in the Western countries didn't exist any more.