Africa has a way of disappearing from our radar screens. It’s scarcely surprising, then, that the ongoing slaughter of African Christians fails to capture the attention it deserves. Partly this reflects a simple unfamiliarity — most Americans, even “African” Americans just don’t know much about Africa. Moreover, the narrative is, to say the least, “inconvenient.” Despite the many thousands of black lives snuffed out across Africa, “Black Lives M…