Well, it is not only humans that have a "language". Other animals living in groups use a simple language system of, for example, warnings to improve the group's chances of survival. I agree with the first paragraph of Charles' post. However, as for "adopting" a common belief system I feel that a belief system becomes common instead of being adopted, especially among small groups. This is particular among humans in that humans learn behaviour from each other more than relying on instincts when living and working in a group. Therefore, religion (belief) evolves because of the existence of the group rather than being a planned outcome. In my opinion. Gavin