Heresy is from the Greek hairesis
meaning, choose, and by extension in Theological terms, "doctrines of men who have chosen to follow their own views." In general, heresy is a self-chosen doctrine not emanating from God's word. Any doctrine or teaching which is contradictory to established Church doctrine based on the Holy Bible is called a heresy.
For example, Jesus being the Son of God is established Church doctrine based on the Bible. To forsake the word and choose to believe he is not, would be heresy! back