A church that breaks away is a schismatic church. You do not belong to a schismatic church. Your church, while nominally Christian and whose doctrines do derive from Christian dogma, holds and promulgates heretical views i.e. doctrines different from those of the Church. Therefore, ergo, and thus- you are a heretic.
When a group, no matter what it calls itself, leaves the truth of the Bible to listen to the teachings of one man and place him above all others that group needs to be broken away from. The Bible is full of references to the Church which Jesus established and calls it be a number of different names. The name Holy Roman Catholic Church is never one of those names. You need to be careful as to who you are labeling a Heretic. God may be referring to that person as a Christian and one of his faithful children. Are you familiar with the parable of the beam and the mote.