I recall two references to Christianity in the original series Star Trek (Uhura's "Son" worshippers vs "sun" worshippers, and Kirk's “Mankind has no need for gods. We find the one quite adequate.”) In my favorite episode, Balance of Terror, a (nondenominational) chapel was shown on Enterprise.
While I don't recall any reference to Judaism in the show, I have to believe there were Jews on the Enterprise. After all, Jews have survived as a people for thousands of years, so they'll certainly be around a few hundred years from now! And mathematically speaking you'd think there would be at least a couple in a crew of over 400.
So, would a Jewish crewman have one of these?