Have you ever actually read it? The prophecies were deliberately spread over the universe by the Bene Gesserit. The department that does that is called the Missionaria Protectiva, they do that all over the universe so their members can manipulate the locals to be safe wherever they end up. This isn't supposed to glorify those prophecies, it's demystifying them to the point where religion as a whole is showcased as a mere tool to control the masses in later books. It's supposed to criticise the thing you're criticising.