'Original, arresting, provocative,'writes Professor David Knowles in his introduction to this survey of the various influences that have left such decisive marks on Western Christianity. How true is Belloc's famous dictum 'Europe is the Faith'? How far had Christianity already changed in four centuries before the Germanic tribes erased the concept of 'Romanitas'? How much in modern devotions and outlook is due to them with their unprecedented emphasis on intercession of the Saints, on relics and miracles, to the Celtic monks with their penitential practices, and the Spanish 'Holy Wars' against the Moors ? Dr. Mirgeler argues that our present 'secularized' Europe is not due to any specific breakdown, but is the outcome of stresses inherent in 'Christendom' throughout its history.