"Jewish" is an ethno-religious group. This refers to the ethnicity. Most common christian last names is not an apt comparison. A comparable analogy would be most common Irish last names or most common Italian last names, which would be fine.
Also, if someone made a "Most Common Christian Last Names" quiz nothing would happen. The quiz wouldn't make sense, but I think you are imagining some massive consequences that wouldn't exist
Also, if someone made a "Most Common Christian Last Names" quiz nothing would happen. The quiz wouldn't make sense, but I think you are imagining some massive consequences that wouldn't exist