A ritual is not necessarily religious; but it most often is.  It is an established or prescribed procedure.  In anthropology a ritual is described as formal, repetitive, and stereotyped.  It requires human behavior, which is performed in certain places, at set times.  Rituals are necessitated by participants, rather than audiences.  They are usually passed down from generation to generation; but a ritual can also be individualistic and started anew by anyone at any time, such as a baseball player touching a base or something else to bring luck during the game.

My Father Had No Children