For instance, Voodoo is a religion. Its not necessarily about magic, much like Wicca. It draws on ideology from both African religion and some of the concepts of western Christianity. However associated with Voodoo but not to be confused as the same thing is Hoodoo, African magic, a set of magical practises.
Another thing I've found interesting in my research is the origins of the Voodoo doll. We see in popular media (book, movies, comics etc.) it being used to hurt a person. When if you look back through the lore it was actual a form of medicine, used to help a person, much like acupuncture is used today.
In the project that I am working on at the moment (something I originally wrote the bulk of ten years ago) I'm focusing more on the power, the idea of what things could happen if that power is misused. Its certainly more interesting and isn't that really the crux of how Voodoo has been come to be viewed as it is, because it makes it more interesting if its dark and mysterious. I hope to get this projected finished by the spring, so then I can get back to writing the next Cassandra book.