"Like I said, there are always heretics. And again, even "near-universal" acceptance defeats your ridiculous assertion."
Not so. The proliferation of denominations of Christianity since Luther is evidence that my assertion is correct. Every denomination has arisen due to doctrinal differences. I've lost count of the number of denominations now extant.
Minor doctrinal differences are the driving force in the fragmentation of Christianity. It's never the big differences. That leads to other things, like Islam, and Christianity itself. From there, it's the little arguments that lead to the formation of new denominations.
Have you ever attended a Lutheran service in Sweden or Norway? If you did not know, you would think yourself in a Roman Catholic service. It's different here in the USA, of course.
Now we have at least three splinter denominations of Lutheranism, each split off over some disagreement in doctrine. It's most amusing to a student of religions.
It resembles most closely a fractal pattern.
A rescue party came upon a man who had been shipwrecked on a desert island.
There were three nice neat huts.
"What are the three huts for?" asked the rescuers.
"Oh, the first one is my house. The second is my church."
"And the third?"
"Oh, that's my old church, but we had a disagreement."