I could not bring myself to care in any meaningful way, either. Yet I can understand why others, in a distant past, with a very different view of reality, would care. Even to religious people nowadays, life is primarily cocerned with the 'real world', and faith is just one aspect of one's life. The term 'real world' says so very much! Because when I read about these ages-old religious controversies, I'm always left with the distinct impression that to the people involved, the matters they are discussing are as real as the physical world. To get this seeminhly meaningless detail wrong is to misrepresent God-- it is heresy, it is sin, it is evil. We may well say "Oh, get some perspective, fellas!", but when this religious aspect of your life is so important as to be interwoven in every aspect of your identity, then what we call details become crucial points of orthodoxy.
One day, historians will marvel at the things we held to be sacred and sinful. I cannot even venture to name these things, because to me, right now, they probably seem self-evident and beyond contestation. centuries from now, people will wonder how we could ever have held so tighly to such 'bizarre notions' as we no doubt do without ever realising it.
For those future historians, as for us, it simply holds true that (as Hartley informed us): "The past is a foreign country: they do things differently there".