LOL...I'd fall down on the "similar" side...simply because to me, "similar" can be both perfectly identical, and/or slightly different.
I can understand division in the sense of defending truth and your understanding of it, but I can never understand the acrimony and fighting. If no accord is possible, simply part ways. In the case you cite, I’d have to side with the ‘same substance’ division, but I’m not interested in theological mayhem - let the dead bury the dead. To my lights, God has never seemed to care too much for the idea of a static organization representing his interests. Instead, yielded individuals tuned into his unchanging nature seem to carry his ideals and purposes forward.
BTW, thanks for your service - Veterans Day tomorrow!
G’night!
LOL...I'd fall down on the "similar" side...simply because to me, "similar" can be both perfectly identical, and/or slightly different.