While the end seems to suggest "bitter coincidence", the events do line up. The religious nut proposes that the boy be made a human sacrifice, something which is resisted by the sane members of the group. On the road, after the boy and the other members of the group are dead, everything is better. In effect, after the boy - who was proposed to be a sacrifice - dies, the problem goes away.
There is always the dim hope that one of the Really Big Things stepped on the store, even if any of the Small or Medium Things didn't somehow get in (that plate glass and those loading bay doors: they can't hold out against accidental perforation forever). Not that that helps the few nice people left behind, there, though.