But because Jewishness is a cultural as well as religious
category, it's also possible to be a secular or atheistic Jew, as
well as a Jewish convert to another religion.
The followers of Judaism are called Jews, Israelites or Hebrews in English. Yidden in Yiddish, Yehudimor Bnei Yisrael in Hebrew. Juif in French and Jude in German.