I've been reading about the Rwandan god Imana, who by all accounts was the sole god worshipped by the Rwandan people, long before colonization by Christians. I've read that their monotheistic belief system, which was in other respects quite different from Christianity, eased conversion attempts, but the rapid dominance of Christianity also erased much of the knowledge about this belief system. Do we know enough to say conclusively that Imana was indeed wholly 'unrelated' to yhwh, God, and Allah, and were there other monotheistic belief systems in Africa or elsewhere that have similarly been erased?
And to go beyond even this question, I've just come across a book which claims that monotheism comes out of Africa:
African Origins of Monotheism recasts an African knowledge of God in a new and original way. It aims to recapture concepts of God as originally reflected upon by pristine African religious thinkers. Muzorewa is seeking after the traditional African understandings of the Divine, which trace their origins back before the rise of Judaism, Christianity, and Islam. Monotheism, he maintains, is the ancient view of God, ubiquitous across the continent of Africa; indeed, monotheism comes "out of Africa."
Does this claim have any credibility whatsoever?