1) Instructor 2) Religious instructor 3) Teacher 
• (n.) One who instructs by question and answer, especially in religions matters.
Pastoral worker who assumes the task of systematically educating children, youth and adults in the faith
Cat'e·chist (kăt'e*kĭst) noun [ Latin catechista , from Greek ] One who instructs by question and answer, especially in religions matters. 
[n] - one who instructs catechumens in preparation for baptism
noun one who instructs catechumens in preparation for baptism (especially one using a catechism)