The traditional African religions (or traditional beliefs and practices of African people) are a set of highly diverse beliefs that include various ethnic religions. Generally, these traditions are oral rather than scriptural, include belief in a supreme creator, belief in spirits, veneration of the dead, use of magic and traditional medicine. The role of humanity is generally seen as one of harmonising nature with the supernatural.
The Nommo are mythological ancestral spirits (sometimes referred to as deities) worshiped by the Dogon tribe of Mali. The word "Nommo" is derived from a Dogon word meaning "to make one drink." The Nommos are usually described as amphibious, hermaphroditic, fish-like creatures. Folk art depictions of the Nommos show creatures with humanoid upper torsos, legs/feet, and a fish-like lower torso and tail. The Nommos are also referred to as "Masters of the Water", "The Monitors", and "The Teachers". Nommo can be a proper name of an individual, or can refer to the group of spirits as a whole.
More about Nommo and its relation to Dogon astronomy...
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||African religion, seen through the Sereer religion, has most of the traits of a religious trend: it has a theory, latent, but coherent, oriented toward sacred transcendence as source of life, communication and participation. An ethics proposed by the old tradition, with a sense of right and wrong. A popular cult. Places of worship. A corpus of prayers. A mystical life, reserved for initiates. A well-prepared staff, from Pangool [ancestors’ spirits] priests, seers, healers and leaders of religious worship, the Saltigi, not to mention a multitude of celebrants dedicated to family and local cults. A whole life based on the religious experience. It is a true religious path, whose central theme could be formulated as follows: "the divine in man.
Babacar Sédikh Diouf
Source: Diouf, Babacar Sédikh, "Le Sérère, Paganism Polythéiste ou Religion Monothéiste" [in] Camara, Fatou Kiné (PhD) & Seck, Abdourahmane (PhD), "Secularity and Freedom of Religion in Senegal: Between a Constitutional Rock and a Hard Reality", p 860-61 (PDF - p. 2-3) 
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A terracotta sculpture from the Nok era
believed to be made between the 6th century BC–6th century CE
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