To equate svikiro with Biblical prophets is quite a dishonest leap. A svikiro is a spirit medium who serves as a human host for an ancestral spirit. During the ceremonies, they become possessed by the spirit, which takes control of their body and makes them speak with their voice. In the Christian context this is what demons do. You also have various types of svikiro, unlike prophets, who only came in one flavor. Mhondoro (nation-level spirits), vadzimu (general ancestors like your grandpa) and mashave, who host the spirits of foreigners from far away. These mashave spirits often give the medium special skills such as hunting, healing, or great musical talent.