Heretic idiot

From idios "one's own". We use ‘idiot’ in much the same way as ‘autist’ is often used by Internet users, and ‘heresy’ has been used by Christians. Heresy actually, if we take it to be a transliteration of the Greek word hairesis meant "a taking or choosing for oneself, a choice, a means of taking; a deliberate plan, purpose; philosophical sect, school". Even the Christians were regarded as heretics. "The Greek word was used by Church writers in reference to various sects, schools, etc. in the New Testament: the Sadducees, the Pharisees, and even the Christians, as sects of Judaism." [Etymonline.com]
And idiot has a peculiar opinion against the doctrine of the Lord. Idiot heretic thus refers to one who has a sect of his own opinion as opposed to general truth.