It's a wonderful day, Dr. E, because I enjoyed your reply and, miraculously, agree with most of it. :)
However, the verses you quote although they address the topic propose a self-test. That is not reliable, because there are no checks and balances.
And, IMO, that's why a presbyterian structure of the church is optimal -- a system of checks and balances among equals, rightly dividing the word of God, subject to a community of like-minded elders and presbyters
That is your opinion and I respect that, but checks and balances among equals and like-minded people are little more than patting each other on the back, imo.
But we are all equal in the eyes of God. From Pope to prince to maid to Mary herself. All who claim God as their savior are equal.