Voodoo is hypnosis. It works only because people believe it does. Reality runs on code/information. Choose what you agree to wisely.
I'm reasonably sure there is a belief component in there, kind of like a negative placebo. But you don't believe in any sort of dark spirits behind it?
While we are communicating again, (I haven't read all of you posts so forgive me if I missed something). I remember you stated you use Tarot cards.
Do you believe in any sort of gods? Do you believe there are some spirits who are stronger than others? Do you believe in any sort of deception from the spirit world? Do you believe in any sort of good and evil struggle in the spirit world?