Someone on another thread pointed out that while this particular bit of fiction doesn't exactly work as SF, it certainly could be branded as "horror". Just...not very good horror. In that it's the sort of "hey, my soapbox, let me show u it" horror which would get his ass bounced outright from most markets, even if they weren't also taken aback by its blatant racism/sectarianism. (If he wasn't Dan Simmons, that is.;))