 Ideally, a guide to the nature and history of philosophy of religion would begin with an analysis or definition of religion. Unfortunately, there is no current consensus on a precise identification of the necessary and sufficient conditions of what counts as a religion. We therefore currently lack a decisive criterion that would enable clear rulings whether some movements should count as religions (e.g., Scientology or Cargo cults of the Pacific islands). But while consensus in precise details is elusive, the following general depiction of what counts as a religion may be helpful: