What is the difference between Apostasy and Heresy?
The terms are pretty much synonymous. They both refer to a religious deviate. Heresy was coined by the early Roman Catholic church to refer to those deviated from the Catholic Church. The term Apostasy is used by the Bible to denote one who strays from the pattern of truth found in the Bible. Often the term "apostasy" will refer to one who has declared a belief or affirmed an attachment to a set of beliefs, but later attempts to lead other adherents to stray from those beliefs; "heresy" is often used to refer to a similar situation led by a non-adherent.