This is a stretch, but I’m a Wodehouse fan, so I thought I’d note that in this book he pokes fun at Constable Dobbs, who reads Robert G. Ingersoll, an American agnostic. I’ll also note that elsewhere Jeeves observes that Nietzsche is “fundamentally unsound” (from the short story “Jeeves Takes Charge,” later included in the book Carry On, Jeeves).