Consider:
1) Jesus is God (consubstantial with the Father).
2) Jesus is a creature (not consubstantial with the Father).
(1) and (2) above cannot both be true ... I'm not sure how the Anabaptists propose to resolve that sort of dispute. The Catholic Church resolved that particular dispute in the Council of Nicea.
I agree that Truth is not determined by majority vote ... certainly not in the sense that it can be changed in the next majority vote.
I'm not sure how the Catholics (or the Nicene majority, for that matter) resolve the dispute about Jesus praying to God in the Garden of Gethsemane or later on the cross. Is he praying to himself?
Then there is the account of his baptism, when he arose out of the water, God's voice spoke from the heavens and the Holy Spirit descended upon him in the form of a dove.
And, yet, I am not so arrogant to say that any sect in the Nicene majority is not Christian. Certainly not those (including the Catholics) who have steadfastly refused to embrace homosexuality as part of their doctrine.
FWIW, this is the big part of the 5% of my disagreement with the Foursquare Baptist denomination which I used to attend and why I eventually felt unwelcome there.