Religion is a general term. It can mean different things to different persons. It can also mean different things to the same person in different stages of spiritual growth.
From the primitive instincts of human thought to the refined, the desire to worship something or someone has found expression in some form of religious devotion.
Religious thought, as it becomes more spiritual, lays off the lower for the higher, the base for the pure, the superficial for the fundamental, the form for the substance, the symbol for the reality. When emphasis is placed upon Truth and Love rather than upon doctrines and creeds, Principle becomes more important than person, Spirit replaces matter, and the human self is redeemed by the divine.