[caseinpoint]

Heresies are like beauty, they are in the eye of the beholder. Every faith holds itself to be the most complete truth on earth, does it not? Therefore, a heresy is anything which contradicts the truths held by that faith. To Protestants, Jews, Muslims and others, Catholicism is a heresy (or many heresies). But the article is interesting, I must say. ;o)

[Mad Dawg]

I think maybe not exactly. A heretic, by definition, picks and chooses, and errs in omission or in over-emphasis of some point or points. So you gotta be CLOSE but wrong on this or that. A Buddhist is not a heretic, in this use of the term. He's an infidel. A Muslim just barely is because he claims to worship the God of Abraham, Isaac, and Jacob, as we also claim, but he has a VERY different view of that God, not to mention of His Son.

And of course, from our POV, the holding of different opinions by different groups does not mean that none of the opinions is true.