Nietzsche's basic claim is that Christianity is a poisoner of western culture and perversion of the words of and practice of Jesus. Throughout the text, Nietzsche is very critical of institutionalized religion and its priest class, from which he himself was descended. The majority of the book is a systematic attack upon the interpretations of Christ's words by St. Paul and those who followed him. Nietzsche claimed in the Foreword to have written the book for a very limited readership. In order to understand the book, he asserted that the reader "... must be honest in intellectual matters to the point of hardness to so much as endure my seriousness, my passion." The reader should be above politics and nationalism. Also, the usefulness or harmfulness of truth should not be a concern. Characteristics such as "Strength which prefers questions for which no one today is sufficiently daring; courage for the forbidden" are also needed. He disdained all other readers.

    Randi and his team of researchers attended scores of "miracle services" and often were pronounced "healed" of the nonexistent illnesses they claimed. They viewed first-hand the tragedies resulting from the wide-spread belief that faith healing can cure every conceivable disease. The ministries, they discovered, were rife with deception, chicanery, and often outright fraud.Self-annointed ministers of God convince the gullible that they have been healed - and that they should pay for the service. The Faith Healers examines in depth the reasons for belief in faith healing and the catastrophic results for the victims of these hoaxes. Included in Randi's book are profiles of a highly profitable "psychic dentist", and the "Vatican-approved wizard."