Prediction: within a month of this film (which looks badass) being released, there will be scads of blog posts and articles from people who watch this and then read the book, where they will discover that wherever the word “crusade” was used in this movie, the word “jihad” was used in the book.
The two words mean basically the same thing: “holy war.” It’s just that historically, holy wars associated with Christianity have been called “crusades” and holy wars associated with Islam have been called “jihad”.
I get why this change was made: to avoid association with terrorists who consider themselves jihadists.
But what’s gonna end up happening, I bet, is that there’s gonna be a lot more attention paid to the nomenclature used for holy wars in the Dune universe than there would have been if they’d just kept calling it “jihad.”
Which is probably good for marketing… no such thing as bad publicity and all.