Swami Vivekananda suggests that religion originated from 1) ancestor worship, which is the attempt to extend the life of a body after death, and also from 2) awe of the natural world. In the former, the idea of a soul separate from the life of the body is inferred from the dream-state; it was assumed that if the mind is active while the body is inert, then something lives through the body that is not dependent on the body and therefore immortal. The latter idea, of nature worship, when explicated further, explains the birth of various traditions as Truth was transmitted from India into China, Babylon, Egypt, Greece, Jewish mysticism, and the Roman Initiatory Schools that became Christianity.
In addition to ritual symbolism and myths describing universal principles of number, geometry, astronomy, cycles of fertility and farming, and psychology, each religious tradition shares the idea of the omnipresent Being: an infinite, undivided, unchanging Reality not obvious to the senses but accessible to the intuition and known by analogy. This is the Source and End of all creation, the Essence and Sustenance of all creatures, and the basis for morality and ethics. All forms are interdependent, as a point with no dimension gains dimension through relation to another point. Out of mutual arising come obligations and duties.