Not really, but I think it can be a useful and/or fun way of thinking about various things. I don't believe in ghosts objectively for instance, but I believe most of the people I know who tell me they've seen one. If a ghost is supposed to be an impression left on the world by a now-dead person, I don't see why it's got to be an entity made out of ectoplasm instead of being the impression they left on a person who survived them