Mythologies

Religion genre/form terms: information gathered on behalf of the Library of Congress... American Theological Library Association, et. al, c2012: Myths (This heading is used for traditional communal or communally upheld accounts explaining natural phenomena or social practices. Such stories frequently involve supernatural beings or events; UF Mythologies; BT Legends)
Merriam Webster online, June 2, 2015: myth (a story that is usually of unknown origin and at least partially traditional, that ostensibly relates historical events usually of such character as to serve to explain some practice, belief, institution, or natural phenomenon, and that is especially associated with religious rites and beliefs)

Traditional stories that ostensibly explain natural phenomena, beliefs, or practices, and are frequently associated with religious rites and beliefs.