I'm not an expert on either Vodou or Rastafarianism, but I don't see how that would be a problem. Now, I am intrigued by your mention of "Christian missionaries from somewhere" trying to convert people. If you're interested, I would be happy to suggest either the Church of Tytor or the Tytorian Reformed Church for the source of those missionaries. If it matters to you, they're essentially Anglicans and Calvinists, respectively.