Reasons for Church Splits

I'll even take it a step farther: I will go on record as to say that few splits—if any—have ever been purely theological. Every split is probably a combination of at least two of more of these factors.
Well, they say never say never, right? Given the thousands and thousands of Christian denominations, I can't say for sure that there has never been a split which hasn't been based entirely on theological grounds. However, I would suspect that even if it seemed like there were, there were also probably cultural or generational differences dovetailed into the mix somehow. Even some of the most famous splits, such as between Catholics and Lutherans in the 16th century Reformation or between the Churches of the East and West over the Chalcedonian Creed in the 5th century, may have been driven as much by different cultural approaches to language and inflection that could very well have factored heavily into what seemed like theological differences. In other words, it was like both groups were looking at the same coin, but one was describing the front and the other the back. What seemed like irreconcilable differences were perhaps more a difference in perspective rather than content.

Source: The Traveling Ecumenist  -  "Why would a group dedicated to Christian unity talk about justice?", Traveling Ecumenist blog post on 29 April 2019
https://travelingecumenist.blogspot.com/2019/04/why-would-group-dedicated-to-christian.html