The present investigation was concerned with the effectiveness of religion in personality development and the significance of church attendance in ethical and moral control. These concepts were related to specific diagnoses of psychiatric patients to ascertain the effect of religion upon those patients diagnosed as paranoid-type schizophrenics and as sociopaths. In addition, the effect of this variable on other variables related to the patient's past religious experience, such as church attendance, was examined. The religiousness of the patients was measured by a single religious intensity questionnaire.