In the beginning man created god. No. Diop didn’t write that. But he alludes to it in this passage
Because of the requirements of agricultural life, concepts such as matriarchy and totemism, the most perfect social organization and monotheistic religion were born. These engendered others; thus, circumcision resulted from monotheism; in fact, it was really the notion of a god, Amon, uncreated creator of all that exists, that led to the androgynous concept. Since Amon was not created and since he is the origin of all creation, there was a time when he was alone. To the archaic mentality, he must have contained within himself all the male and female principles necessary for procreation. That is why Aomn, the Negro god par excellence of the “Anglo-Egyptian” Sudan (Nubia) and all the rest of Black Africa, was to appear in Sudanese mythology as androgynous. Belief in this hermaphroditic ontology would produce circumcision and excision in the Black world.
[..]By contrast, the ferocity of nature in the Eurasian steppes, the barrenness of those regions, the overall circumstances of material conditions, were to create instincts necessary for survival in such an environment. Here, Nature left no illusion of kindliness; it was implacable and permitted no negligence; man must obtain his bread by the sweat of his brow. Above all, in the course of a long painful existence, he must learn to rely on himself alone, on his own possibilities. He could not indulge in the luxury of believing in a beneficent God who would shower down abundant means of gaining livelihood; instead he would conjure up deities maleficent and cruel, jealous and spiteful; Zeus, Yahweh, among others.[emphasis mine]
And elsewhere he writes about the human origins, he says
Although scientifically attractive, the hypothesis that man existed everywhere at the same time will remain inadmissible so long as we fail to find fossilized man in America, a continent not submerged during the fourth quaternary when man appeared and on which we have all the climatic zones from the South Pole to the North Pole