That parable came to mind immediately. There is in fact a god that labels unanswered nagging as acting unjust. A lifetime ago in seminary I knew a guy who rage quit after spending months contemplating the implications of that passage and observations about how common it is to see others unanswered prayer. Don't know what happened to him but he would just mutter that his beliefs didn't matter since "jesus defacto makes the claim he is unjust and defeats himself", the problem of suffering indeed.