You have to understand that believing that all these biblical personalities were black is a sort of coping mechanism to deal with the fact that their beliefs were forced on them by another race of people. They don't want to identify with west/central Africa because the white man brainwashed everybody(not just black folk) into thinking those people were inferior and had no culture to be proud of before they were snatched up and brought to the new world, which is false. Some black folk do try to connect back to where their roots really lie, but the vast majority of these ethno-centrists and people who choose to make the Bible some sort of black supremacy text book take the easy route and start to claim that everyone in history the white man considers to be great was in fact "black." It's ironic because in a way this mode of thinking concedes superiority to the white man because it's the white man who has the final say as to what/who is superior/inferior. Then these guys will even twist and stretch their definition of what "black" is just to suit their own foolish historical views - that's how this nonsense eventually got to the point where the Olmecs became black, the Sumerians became black, the Indians became black, the Chinese became black, etc....it has been an interesting phenomenon, and unfortunately with the advent of the internet, this kind of garbage has spread like wildfire....it didn't really spread before because these theories are laughed at and not taken seriously by any stretch of imagination in the academic world.
It's funny because one of my aunts who is into heavily into Art has mad African art among her collections, she loves it. She is a doctor and has been to Africa many times and loves the culture over there....she is always bringing back sculptures, artwork, etc. to display at home. But these guys don't want to know anything about the culture over in those parts of Africa because they want nothing to do with it, instead they want to run around calling themselves Pharoah's and Israelites....post pictures of people who are clearly middle eastern/arab types and then say shyt like "that looks like my brother," "that looks like my cousin," I'm sorry but it's a sad thing to watch. When you post a picture of pure Black Africans and tell them that is what their ancestors looked like they accuse YOU of being a racist and say "not all black people look like that!! you're just a racist, black people are diverse!!" like they have some sort of problem with being associated with the blackest of black Africans or something
Check this out though, you have a Hebrew Israelite in here talking about how African people are evil and are going to be led into slavery along with all other races by the Israelites in the future. But that doesn't illicit any protest from these guys, nope. They have no problem with that whatsoever. What does get them riled up though? When you say Jesus wasn't black. Hmmm.