To start, considering the definition of heresy as defined (in part) on the King James Bible Page on av1611.com, specifically
- A fundamental error in religion, or an error of opinion respecting some fundamental doctrine of religion. But in countries where there is an established church, an opinion is deemed heresy, when it differs from that of the church. The Scriptures being the standard of faith, any opinion that is repugnant to its doctrines, is heresy; but as men differ in the interpretation of Scripture, an opinion deemed heretical by one body of Christians, may be deemed orthodox by another....
Further God's law, as set forth in Deuteronomy 19:15 provides
A single witness shall not prevail against a man for any crime or for any wrong in connection with any offense that he has committed; only on the evidence of two witnesses or three witnesses, shall a charge be maintained.
Finally, the item in the Help center about questions not to ask, which provides, in part
insist that opinion be backed up with facts and references
Taking note that in his answer to his own question, the OP has provided a but single witness, but has provided no facts and references have been provided to support of the charge that "the vast majority vast majority of the members of the Church here on earth, including those comprising the hierarchy or even the Pope, profess heresy", the question as it stands is mere opinion, and unanswerable, except to take recourse to the teaching of Jesus Christ, in the parable of the sower (Mt. 13:34 ff). Jesus, the Sower of the church, holds the sole prerogative, to determine if there are heretics, and if so, who they are, and to separate them out at the harvest.