Nzambi a Mpungu is the Kongolese name for a high creator god. The idea of such a god spread from Central Africa into other Kongo related religions.
History
He is mentioned as the name for God as early as the early sixteenth century by Portuguese visitors to the Kingdom of Kongo. This deity has been known as the high and creator god from before this time until today. European missionaries along with Kongo intellectuals set out to render European Christianreligious concepts into Kikongo and they chose this name to represent God. Jesuit missionaries in the 1540s noted the acceptance of this relationship as well, and it was probably included in the now lost catechism produced by Carmelites in Kikongo in 1557. Certainly it was used for God in the catechism of 1624, a translation by the "best masters of the church" in Kongo under the supervision of the Jesuit priest Mateus Cardoso. It is not clear if the elevation of Nzambi a Mpungu to the status of creator god and equivalent to the Christian God by priests and missionaries was the reason that he is regarded as such by modern Kongo cosmology, or whether he was always considered the creator. However, in the Kingdom of Loango, a Kikongo-speaking area that never accepted Christianity as its national religion, reports by Dutch visitors also gave this as the name for God.
Theology
Kongo mythology
Nzambi a Mpungu is the creator of the universe. After creation he became bored with the world and mostly withdrew from it. However, Nzambi Mpungu still animates the natural occurrences of the world. Another related deity is Nzambi the god of Earth's mystery. She was sent to Earth by Nzambi Mpungu who then is married to him making him the father of all creation. Nzambi gave the humanity its laws, arts, and games, as well as settled quarrels between animals. She would also steal some of Nzambi Mpungu's fire.
In the religion of Candomblé Bantu, Nzambi is the "sovereign master". He created the earth and then withdrew from the world. Nzambi Mpungu remains responsible for rainfall and health.
In the religion of Palo, "Nzambi" is the god who created the universe and animates it. Nzambi resides in all natural things, and the spirits of the dead. Long deceased ancestors who have become spirits will over a long period of time become enveloped in the natural elements and thus Nzambi himself. The natural powers of Nzambi can be harnessed by a Nganga and in common ceremonies.