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Whatever you want that to mean.
https://en.wikipedia.org/wiki/Who_is_a_Jew%3F
There is no universal way to define who is a Jew.
So if you could maybe not start with a semantic argument about how the Holocaust wasn't "actually" a genocide, that would be fantastic. Thanks.
The Jewish people have a right to exist.
I'm not going to stand blithely by while people chip away at that by JAQing the proposition that there is even such a thing as the Jewish people.
The question is is whether it's a useful category for this purpose. I think it is.
But you can also divide it up various ways - Levantine, Sephardic, Ashkenazi.... Are the Lemba Jewish according to you?
Does it matter whether they're observant or not?