All about it here
I'm amused by the fact that they've had the books on the library shelves, presumably, for a good few years, and have only just noticed that the author is - gasp, shock, horror! - an atheist. It's not as if PP attempts to make any secret of the fact!
All about control. As usual.
(Do you think I could ask for the Bible to be removed from my local children's library because of all the sex and horrific violence in it? Nope, thought not.)