Since the Enlightenment, historians and theorists of religion have often worked with a two-tiered model of Christianity, in which the pure belief and practice of the enlightened few was perceived as constantly under pressure and in danger of corruption or distortion from the grosser religion of the multitude. This imagined polarity between the sophisticated religion of the elite and the crude religion of the people at large underlay much Enlightenment historiography, most notably Gibbon’s account of the early history of Christianity, and has remained potent in such influential twentieth century works as Keith Thomas’s Religion and the Decline of Magic. Even the future Cardinal Newman could contrast ‘what has power to stir holy and refined souls’ with the ‘religion of the multitude’ which he once described as ‘ever vulgar and abnormal’. Newman, as more than one contributor to this volume shows, had in fact an acute sense of the value, even the normative value, of popular religious perceptions, but those implicit polarities and the historical condescension they encode have been recurrent and assertive ghosts, haunting the writing of religious history, in contrasts between official and unofficial religion, or those between clerical and lay, literate and illiterate, rich and poor, hierarchical and charismatic.