Every religion has got traditions and customs, all of them based on myths that have been followed for ages and we call them by different names - traditions & customs are a couple of them.
We, humans, have a unique ability to create myths and imagine so that there is an ever-growing sect of people that keeps on growing. The more the people following a particular belief(myth), the larger territory it acquires on the planet. The larger territory is a representation of the power of the leader of the sect.