Do not get me wrong maxwel, I think what you wrote is very illustrative, but seldom are break ups in groups due to non essentials.
The splits are precisely because what groups consider very essential.
To be clear, I think Calvin is important, has much to teach us, but it looks like some people do not see the big picture here:
Jesus died for us (not Calvin), we are to be Christlike (not Calvinlike), Jesus came to baptize us with the Holy Spirit (not teach us original language exegesis [although is very important]), Augustine was the first to suggest cessationism, and he had to take it back because of the amount of miracles happening in the place he gathered with other believers to worship.
Calvin seems did not get that take back from Augustine. And kept pushing cessationism.
Magdalene had to have 7 unclean spirits expelled from her before she could become a disciple, the Bible tells us that in end times there were going to be people worse than her, so what is the Kingdom of God about? the finger of God expelling unclean spirits so that persons can be free to truly hold on to Christ.
This is the heavy stuff that divides, if all were non-essential, there would even not be break ups.
I am polite because I respect you, and because the fruit of the Holy Spirit has to show in us.
I am not pushing for any denomination in particular because I think most have good things to offer. But I do encourage for all to acknowledge God's reality, the Kingdom of God is His finger doing wonders (Holy Spirit, and His gifts to us), they can continue in their denomination, but do not deny the supernatural.
God's natural reality is supernatural to us because we are living in a fallen one. His reality is perfect. When He visits us then supernatural things happen (the imperfect gets fixed) because of His love for us His adopted children.
Both scholasticism (fine rational function), and Holy Spirit realm experience are needed (Paul was a perfect example of the mix).
Kind regards.