If someone says they’re Jewish, it means their mom is Jewish, and unlike many other religions, that’s handed directly down through bloodline, enforcing a shared ethnicity between members of the Jewish community silver you don’t join by choice but automatically through genetic inheritance.
I didn’t invent the quote "“racism does not have to be based on race”.
I don’t see how you can understand prejudice against an ethnicity as anything other than racism and am asking you to clarify that position.