Kongo religion (KiKongo: Bukongo) is a broad set of traditional beliefs from the KiKongo speaking peoples. The faith bases itself in the idea of a main creator god named Nzambi Mpungu who made the world and spirits who inhabit it. Priestly doctors known as Nganga try to heal followers' minds and bodies. Mediatory roles like being a Nganga require legitimization from the other world of spirits and ancestors. The universe is split between two worlds, one of the living (nza yayi) and a world of the dead (nsi a bafwa), these worlds are split by a body of water. Humans continually pass through these worlds in cycle.