To the best of my knowledge, this words original meaning is to "be different or to have different beliefs". A common misunderstanding is that anyone who is a heretic is more than likely a satanist and enemy of God. This is not always true. For me, it just means "Different".
I do not believe what everyone else believes about something, I am a heretic.
There is no true thing as a heretic, for God made everyone the way they are supposed to be....