Black Judaism
Black Judaism is the collective term used to describe sects of Judaism predominantly practiced by the members of the African communities, both within the African Continent and outside Africa (such as North America). It is theologically characterized by the selective acceptance of the Judaic faith (in some cases such selective acceptance has historical circumstances), and that the belief system of Black Judaism is significantly different from the mainstream sects of Judaism. In addition, although Black Judaic communities adopt Judaic practices such as Jewish holidays and Jewish prayers, they are generally not recognized by the mainstream Jewish societies as legitimately Jewish.
List of Dune religions
These Jewish communities are led by rabbis, at least some of whom have working relationships with the Bene Gesserit. "Heretics of Dune" suggests that Jewish thought may have influenced the development of Bene Gesserit philosophy. The Jewish community described in the novels defines itself as part of "Secret Israel", which, in conjunction with the sparse historical information given in the novel, suggests that the Jewish people had decided to conceal themselves to follow their religion and avoid the recurrent atrocities of their past. Long ago, the Bene Gesserit and the hidden Jewish communities came to an understanding of sorts: the Bene Gesserit would provide aid to hidden Jews if they were ever threatened, and help hide the fact that the Jewish religion survives in secret; in return, if ever a Bene Gesserit acolyte is lost and threatened on an isolated planet, the local Jewish community give her aid and shelter. A simple arrangement, but one which endured between both groups for millennia. Moreover, the Torah and Talmudic Zabur are listed in Appendix II of "Dune" as having contributed to the Orange Catholic Bible; the appendix also notes that these books were preserved on Salusa Secundus.