They are like passwords for access.
Stories provide the core of group identity.
Part of the preparation for baptism and for confirmation involves learning the stories of Faith. To be a member of a group, we must know the group's stories. I am certain that each of us has tales to tell about being a newcomer in some group. My personal favorite involves a time that I received directions in a place new to me. Obviously, knowing where to go and how to get there represents a problem for any newcomer.