Lots of commenters are (a) reading a lot of words that I didn't write in this article about "banning" the books, and (b) claiming that the books "can't indoctrinate kids" (these aren't actual quotes that were used; they just encapsulate arguments that have been thrown around).
The first is funny. The second misunderstands how propaganda works.
Kids aren't going to put down the books and go beat up an Arab and then rush to church. They have, however, been given the seeds of Islamophobia and Christian theology in the form of feelings, associations, symbols, and ideas. But mainly feelings.
Those seeds can sprout. For Christian theology, someone can explain the complex idea of divine providence by saying "remember how, in The Horse and His Boy, the plot was messy but it all came out right in the end because Aslan was working it all out?" and the kid goes "ohhh..." For Islamophobia, the negative associations created by the book can make kids more likely to notice things that confirm them.
Given how many options there are that don't sow these seeds, I would really judge someone who knowingly chose these books for their kids to read.