The Bantu expansion carried more than a language. Across the whole area it reached, related terms recur for the ancestors, for the spirit of a person, for the diviner and for the medicine or charged substance a specialist works with, and the concepts move with the words. That is why the religions of peoples separated by two thousand miles are recognisably in conversation with each other, and why comparative work on African religion has to distinguish between inheritance, borrowing and independent development just as carefully as comparative work anywhere else.
Outside Bantu the same family holds Yoruba, whose orisha tradition is documented as thoroughly as any in Africa; Akan, with its abosom and its adinkra symbols; Igbo, whose Odinani names a supreme being and a body of intermediary forces; and the Gbe languages of the Fon and Ewe, which gave the word vodun. The Atlantic slave trade then carried these traditions west, and the religions of the African diaspora, Candomble, Santeria, Vodou, Palo Monte and Umbanda among them, use liturgical vocabulary drawn directly from Niger-Congo languages, some of it preserved in the Americas in forms older than the ones now spoken in West Africa. A liturgical language can outlive the ordinary speech it came from, and here it did.
Sources African Religions and PhilosophyJohn S. Mbiti with The Bantu LanguagesDerek Nurse and Gerard Philippson (eds.), Black Atlantic Religion: Tradition, Transnationalism, and Matriarchy in the Afro-Brazilian CandombleJ. Lorand Matory