Describe ancient celtic religion of animism

THE modern belief in fairies, with which until now we have been specifically concerned, is Celtic only in so far as it reflects Celtic traditions and customs, Celtic myth and religion, and Celtic social and environmental conditions. Otherwise, as will be shown throughout this and succeeding chapters, it is in essence a part of a world-wide animism, which forms the background of all religions in whatever stage of culture religions exist or to which they have attained by evolution, from the barbarism of the Congo black man to the civilization of the Archbishop of Canterbury; and as far back as we can go into human origins there is some corresponding belief in a fairy or spirit realm, as there is to-day among contemporary civilized and uncivilized races of all countries. We may therefore very profitably begin our examination of the living Fairy-Faith of the Celts by comparing it with a few examples, taken almost at random, from the animistic beliefs current among non-Celtic peoples.