In another work[18] I have traced the origin of the belief in God to the mental state of primitive mankind, and there is no need to go over the same ground here at any length. Commencing with the indisputable fact that religion is something that is acquired, an examination of the state of mind in which primitive mankind faced, and still faces, the world, led to the conclusion that the idea of god begins in the personification of natural forces by the savage. The growth of the idea of God was there traced back to the ghost, not to the exclusion of other methods of god making, but certainly as one of its prominent causes. I must refer readers to that work who desire a more extended treatment of the god-idea.
What remains to be traced here, in order to understand the other factor that is common to religions, is the belief in a continued state of existence after death, or at least of a soul.
It has been shown to the point of demonstration by writers such as Spencer, Tylor, and Frazer, that the idea of a double is suggested to man by his experience of dreams, swoons, and allied normal and abnormal experiences. Even in the absence of evidence coming to us from the beliefs of existing tribes of savages, the fact that the ghost is always depicted as identical in appearance with the living person would be enough to suggest its dream origin. But there are other considerations that carry the proof further. The savage sees in his dreams the figures of dead men and assumes that there is a double that can get out of the body during sleep. But he also dreams of dead men, and this is also proof that the dead man still exists. Death does not, then, involve the death of the ghost, but only its removal to some other sphere of existence. Further, the likeness of sleep itself to death is so obvious and so striking that it has formed one of the most insistent features of human thought and speech. With primitive man it is far more than a figure of speech. The Melanesians put this point of view when they say, "the soul goes out of the body in some dreams, and if for some reason it does not come back the man is found dead in the morning." Death and dreaming have, therefore, this in common, they are both due to the withdrawal of the double. Hence we find a whole series of ceremonies designed to avert death or to facilitate the return of the double. The lingering of this practice is well illustrated by Sir Frederick Treves in his book, The Other Side of the Lantern. He there tells how he saw a Chinese mother, with the tears streaming down her face, waving at the door of the house the clothing of a recently deceased child in order to bring back the departed spirit.
Death is thus the separation of the double from the body; but if it may return, its return is not always a matter of rejoicing, for we find customs that are plainly intended to prevent the ghost recognizing the living or to find its way back to its old haunts. Thus Frazer has shown that the wearing of black is really a form of disguise. It is a method taken to disguise the living from the attentions of the dead. It is in order to avoid recognition by spirits who wish to injure them that the Tongans change their war costume at every battle. The Chinese call their best beloved children by worthless names in order to delude evil spirits. In Egypt, too, the children who were most thought of were the worst clad. In some places the corpse is never carried out through the door, but by a hole in the side of the hut, which is afterwards closed so that the ghost may not find its way back.
The ghost being conceived as at all points identical with living beings, it demands attention after death. It needs food, weapons, servants, wives. In this way there originates a whole group of burial customs, performed partly from fear of what the ghost may do if its wants are neglected. The custom of burying food and weapons with the dead thus receives a simple explanation. These things are buried with the dead man in order that their spirit may accompany his to the next world and serve the same uses there that they did here. The modern custom of scattering flowers over a grave is unquestionably a survival of this primitive belief. The killing of a wife on the husband's grave has the same origin. Her spirit goes to attend the husband in the ghost-land. In the case of a chief we have the killing of servants for the same reason. When Leonidas says, "Bury me on my shield, I will enter even Hades as a Lacedæmonian," he was exhibiting the persistence of this belief in classical times. The Chinese offer a further example by making little paper houses, filling them with paper models of the things used by the dead person, and burning them on the grave. All over the world we have the same class of customs developing from the same beliefs, and the same beliefs projected by the human mind when brought face to face with the same class of phenomena.
As the ghost is pictured as like the physical man, so the next world is more or less a replica of this. The chief distinction is that there is a greater abundance of desirable things. Hunting tribes have elysiums where there is an abundance of game. The old Norse heaven was a place where there was unlimited fighting. The gold and diamonds and rubies of the Christian heaven represent a stage of civilization where these things had acquired a special value. Social distinctions, too, are often maintained. The Caribs believe that every time they secure an enemy's head they have gained a servant in the next world. And all know the story of the French aristocrat who, when threatened with hell, replied, "God will think twice before damning a person of my quality."
Several other consequences of this service paid to the dead may be noted. The ghost being drawn to the place where the body is buried, the desire to preserve the corpse probably led to the practice of embalming. The grave becomes a place of sanctity, of pilgrimage, and of religious observance, and it has been maintained by many writers, notably by Mr. W. Simpson in his Worship of Death, that the service round the grave gives us the beginning of all temple worship.
But from this brief view of the beginnings of religion we are able to see how completely fallacious are all those efforts to derive religion from an attempt to achieve an ideal, from a desire to solve certain philosophical problems, or from any of the other sources that are paraded by modern apologists. The origin and nature of religion is comparatively simple to understand, once we have cleared our minds of all these fallacies and carefully examine the facts. Religion is no more than the explanation which the primitive mind gives of the experiences which it has of the world. And, therefore, the only definition that covers all the facts, and which stresses the essence of all religions, high and low, savage and civilized, is that given by Tylor, namely, the belief in supernatural beings. It is the one definition that expresses the feature common to all religions, and with that definition before us we are able to use language with a precision that is impossible so long as we attempt to read into religion something that is absent from all its earlier forms, and which is only introduced when advanced thought makes the belief in the supernatural more and more difficult to retain its hold over the human mind.