apologist

noun

1. a person who makes a defense in speech or writing of a belief, idea, etc.
2. Ecclesiastical.
   1. Also a·pol·o·gete [uh–pol–uh-jeet] /əˈpɒl əˌdʒit/.a person skilled in apologetics.
   2. one of the authors of the early Christian apologies in defense of the faith.

noun

1. a person who offers a defence by argument