I’m not, I wouldn’t trash all the efforts of all the Protestants by any means! Of course I won’t agree that we have a monopoly on tares, though we sho’ ‘nuff have plenty. But ... well, the hymns alone are testimony to the Holy Ghost moving among Xtians not in communion with the Holy See. And most of my theological learning, such as it is, happened at a (Calvinist leaning) Episcopal seminary in the lost days when they believed in God and studied Scripture.
But unity of teaching would be nice. There has been fermentation with some pretty wild grapes from the beginning, hasn’t there?
Yes, it would be nice, but the wheat and tares parable I mentioned says otherwise. Christianity will continue in its present state of wheat coexisting with the tares, until the harvest at the end of the age (aion), when the tares are gathered and burned in the fire, "...there shall be wailing and gnashing of teeth."