In recent years, Kimbanguism has developed from an ecumenically oriented African-instituted church into a new religion. Accordingly, their membership with the World Council of Churches was discontinued in 2021. This process of theological change and reorientation is clearly traced and illustrated on the basis of previously unseen WCC archive materials. The six chapters also show the six phases how the process of disengagement from a religious belief is progressing to start a new religion.