Spirituality and religion are two different things.
Spirituality is how man identifies with the world around him and the mystery of conscious experience. No one can avoid forming a spiritual viewpoint, even if it is to side with the materialist idea that nothing outside of the material exists (which is an interesting thought exercise in and of itself... because is the conscious experience a part of the material world? It's a "whole is greater than the sum of its parts" problem that is impossible to dismiss but also impossible to resolve).
Religion is what happens when groups of people with similar spiritual groundings congregate and socialize. They form structures for taking care of each other, for delegating responsibilities, etc. Religion is the government people of common spiritual beliefs use to minister to each other and to the community around them (as most spiritual beliefs, even materialist varieties, espouse the importance of charity and humility).
Religions that have a long history also begin to develop texts that attempt to document encounters with spiritual entities or struggles, as well as historic events. They are subject to the same influences that any human institution is, and must be taken with that in mind.