You have put the case spot on. I still mention the Cooper books, when the subject of the general genre comes up, but, in that particular context, I always say that Fr. X says they should be avoided, and I have no quarrel with that opinion. Cooper’s stuff is not based, as you rightly say, in the Christian understanding of the universe, any more than is H. P. Lovecraft’s work. I collect Lovecraft, among many other things. I don’t have an interest in Rowling’s work because the story never engaged me. But I understand what each genre is: fiction.