Edited sentence: Delusion is commonly defined as a false belief.List of avatar claimants.Megalomania or Narcissism is the pattern of traits and behaviors which involve infatuation and obsession with one's self to the exclusion of others and the egotistic and ruthless pursuit of one's gratification, dominance and ambition.Some people who believe themselves deities may be under the influence of one or more mental illnesses, see schizophrenia.True-believer syndrome is an irrational belief in the paranormal