Since the rise of scientific hierology there has been a disposition among students to take for granted the good faith of all early religion-makers, and to dismiss entirely that assumption of fraud which was so long made by Christian writers concerning the greater part of every non-Christian system. The assumption had been passed on from the freethinkers of antiquity who formulated the view that all religious doctrine had been invented by politicians in order to control the people. [61] Christian polemists, of course, applied it to all systems but their own. When, however, all systems are seen to be alike natural in origin, such charges are felt to recoil on the system which makes them; and latterly [62] Christian writers, seeing as much, have been fain to abandon the conception of "priestcraft," adroitly representing it as an extravagance of rationalism. It certainly served rationalistic purposes, and the title of the supposititious medieval work on "The Three Impostors" points to its currency among unbelievers long ago; but when we first find it popularly current in the seventeenth century, it is in a Christian atmosphere. [63] Some of the early deists and others have probably in turn exaggerated the amount of deliberate deceit involved in the formation of religious systems; but nevertheless "priestcraft" is a demonstrable factor in the process. What is called the psychology of religion has been much obscured in response to the demand of religious persons to have it so presented as to flatter them in that capacity. [64] Such a claim cannot be permitted to overrule the fair inductions of comparative science.