Real Dictionary

catechism
In a Catholic, Episcopal, or Orthodox Church, the catechism is a series of questions and answers about religious beliefs, which has to be learned by people before they can become full members of that Church.

catechism in American English
a handbook of questions and answers for teaching the principles of a religion
noun: an elementary book containing a summary of the principles of the Christian religion, esp. as maintained by a particular church, in the form of questions and answers

catechism in British English
noun: instruction by a series of questions and answers, esp a book containing such instruction on the religious doctrine of a Christian Church