There is no occasion for asking here whether or not there are scholars who have merited this reproach, and who have made religious history and ethnology a weapon against religion. In any case, a sociologist cannot hold such a point of view. In fact, it is an essential postulate of sociology that a human institution cannot rest upon an error and a lie, without which it could not exist. If it were not founded in the nature of things, it would have encountered in the facts a resistance over which it could never have triumphed. So when we commence the study of primitive religions, it is with the assurance that they hold to reality and express it; this principle will be seen to re-enter again and again in the course of the analyses and discussions which follow, and the reproach which we make against the schools from which we have separated ourselves is that they have ignored it. When only the letter of the formulæ is considered, these religious beliefs and practices undoubtedly seem disconcerting at times, and one is tempted to attribute them to some sort of a deep-rooted error. But one must know how to go underneath the symbol to the reality which it represents and which gives it its meaning. The most barbarous and the most fantastic rites and the strangest myths translate some human need, some aspect of life, either individual or social. The reasons with which the faithful justify them may be, and generally are, erroneous; but the true reasons do not cease to exist, and it is the duty of science to discover them.
In reality, then, there are no religions which are false. All are true in their own fashion; all answer, though in different ways, to the given conditions of human existence. It is undeniably possible to arrange them in a hierarchy. Some can be called superior to others, in the sense that they call into play higher mental functions, that they are richer in ideas and sentiments, that they contain more concepts with fewer sensations and images, and that their arrangement is wiser. But howsoever real this greater complexity and this higher ideality may be, they are not sufficient to place the corresponding religions in different classes. All are religions equally, just as all living beings are equally alive, from the most humble plastids up to man. So when we turn to primitive religions it is not with the idea of depreciating religion in general, for these religions are no less respectable than the others. They respond to the same needs, they play the same rôle, they depend upon the same causes; they can also well serve to show the nature of the religious life, and consequently to resolve the problem which we wish to study.