I would love for him to give examples of how he interprets this from the movie.
That's in the books. The writer lost his noun-verb agreement partway through the sentence.
"Racism," of course, is in the eye of the beholder, but certainly Lewis is not conciliatory toward his equivalent of the Turks.
Lewis attacks Islam viously in one of the books in the Chronicles of Narnia called "A Horse and His Boy".
The books are allegorical lessons in how one should live their lives in a christian manner. This includes the fact that Christians should fight against evil in the cause of right.
In this movie, Islam (Or Narnia's version of it) is not even portrayed because it's not even in THE Lion Witch adn the Wardrobe. In later books in the series, Lewis does deal with a religion which worships "Tass". I doubt that Disney will do any of the sequels that portrays it however. .