It doesn't surprise me. It just shows that a public school shouldn't support any religion because if they do they need to support all religions. The school may just say ok we'll distribute these Wiccan books. That would be interesting. Then all the parents who don't approve of that can speak up. So see it's easier for a school to just have no religious affiliation which is the law anyway.
From the article, it appears the school board acted reasonably and rationally. They had an open policy to all religions, until they realized what constituted all religions. At which time they decided to reevaluate the policy. I would expect no less.