This thesis is a folkloristic examination of the religious beliefs and rituals associated with members of a religious movement known as Mission De L’Ésprit Saint. Mission De L’Ésprit Saint is a Quebecois religious denomination which believes that their founder was the physical incarnation of the Holy Spirit, and the movement strives to continue the teachings which were laid down during his lifetime. The major components of Mission theology and history, as well as an introductory consideration of their cosmology and worldview will be the major focus of this document, as well as a consideration of the role that Folklore has in understanding marginal religious movements.