Sentence:  Yes , he believed that the Jews were `` enemies of the Reich '' , and such a belief is , of course , typical of `` patriotic '' anti-Semites ; but he believed in the Jew as enemy in a kind of abstract , theological way , like a <WSD>member</WSD> of a cult speculating on the nature of things . 
Meaning of the word marked with <WSD> tags:  one of the persons who compose a social group (especially individuals who have joined and participate in a group organization)