This was interesting :
https://www.chabad.org/library/article_cdo/aid/640221/jewish/What-is-the-Meaning-of-the-Name-Jew.htm

A Jew once told me that "Jew" literally means "someone who has a relationship with God." That, to me, means it is someone who uses their own rational capacity to discover hidden truths. An idol is anything which you believe to be true, but which isn't. And rationally, nothing can ever be proven to be true - things can only be proven false. So, I would submit that anyone honestly engaged in philosophy is a Jew, and probably the only people who can be proven to not be Jews are Zionists.  That gets into a whole 'nother discussion, though.