hoodooism

A person who practices/studies/cultivates Hoodoo} ( an African-American based folk spirituality and folk magic).

John Doe is a hoodooist, he's a follower/believer/practitioner of hoodooism.

The origin of hoodooism is as old as mankind's existence.

When one practices the ways of hoodooism, they become a hoodooist/hoodoo mage/hoodoo conjurer.