So the posters argue as if the differences are a matter of life and death for everyone – because in their minds, it is. Many if not most of them believe it is their commission in life to spread their particular doctrine. And none of them are likely to change beliefs.
Very true. Unfortunately, the same people bring those notions with them when they participate in the science threads -- especially, but not limited to evolution threads. Such posters aren't there to discuss science, of which they know nothing and care less, but only to profess their religious creeds.
Rather than moving such threads into the religion forum (as was done here) perhaps it would be better if religiously-motivated, anti-science people were told to stay off the thread (but gently, of course, as you mods are famous for doing). That's common practice in other threads, but it's never yet been done in a science thread. It would help a lot in preventing flame wars.
Nevertheless, your idea for avoiding crevo flame wars is among many which have been considered - and will continue to be discussed - among the moderators.