In severe cases, a person may experience delusions of grandeur, persecution, or other false beliefs, or they may have hallucinations, such as hearing or seeing things that are not there.
Oh like believing that God sent his only son to earth to redeem our sins and was resurrected? Guess we need to put all the people with any religious or speculative ideas like the Big Bang theory, religion and for that matter the DSM in the looney bin.