Deviant beliefs

      How can we define any specific belief as “deviant”? Does the fact that a specific belief is held by the majority of a population make it “not deviant”? Why/why not? Book link: https://ccis.vitalsource.com/reader/books/9780429514920/epubcfi/6/30[%3Bvnd.vst.idref%3DCh07]!/