apostate

One who abjures or forsakes his religious faith, or abandons his moral allegiance; a pervert.
from -oed.com

Opsimathy

Learning conducted or acquired late in life; an instance of this.
--from oed.com

Chrestomathy

A collection of choice passages from an author or authors, esp. one compiled to assist in the acquirement of a language.
--from oed.com