Someone has asked elsewhere what the following novel is: This person (who’s 73 years old) has just reread A Canticle for Leibowitz by Walter Miller for the first time in a long time, perhaps since reading it shortly after it was published, since he’s old enough to have read it then. He says that he confused it in his mind with something else that he read around the same time. The novel that he’s confused it with is “set in a post-nuclear holocaust world, in which some of the main characters appear to do miracles or magic, but it turns out they’re actually using technology - either rediscovered or reinvented. So we have ‘spears’ that emit killing beams - actually lasers - etc.”
Can anyone help him? Do you know of an old novel that fits this description?