Catechism
From Late Latin catēchismus, ultimately from Greek katēkhizein. Manual of religious instruction which tells the young what they should do and should not do in terms of morality, wins converts and testifies to the faith. The aim of catechism is to establish order in society. In other words, religion has an important social function.
Sources:
http://www.collinsdictionary.com/dictionary/english/catechism?showCookiePolicy=true