Share 'is calvinism error or heresy?'

under antother section about the most fundamental doctrines i tried to define what error and heresy are. let me state that briefly again, before i open up the issue at hand. heresy is any doctrine that if followed to its logical conclusion would cause us to deny one of the two most fundamental beliefs in the chrisitian faith. (i.e. there is one god and jesus is savior) - i noted that though s...