In the twilight of his life, as storm clouds gathered over Europe, Sigmund Freud began the most ambitious and controversial analysis of his career. With Civilisation and its Discontents, Freud put all humankind on the couch, and the neurosis he sought to expel was religion. Psychiatry’s relationship with God has been fractious ever since.
Doctors generally view diagnoses as discrete, well-defined entities. You either have malaria, or you do not. You are pregnant, or you are not. There is no in-between. Settling upon one also rules out the others. For example, if a CT on a patient with a splitting headache shows a brain tumour, that’s the diagnosis.