I was homeschooled and many of my textbooks were from religious organizations. The ones that had agendas were usually the biology books, although even one chemistry book I had felt it necessary to contain something about how evolution wasn't true. The agendas in these books weren't hidden, though. If I remember correctly, one biology book even had an entire chapter for debunking evolution, which I thought was odd at the time.
Personally, I don't see how the article was particularly offensive. The only people who would have an interest in removing it are those mentioned (The Expelled movie, James Le Fanu, Denyse O'Leary), and perhaps that one other movie, "What the bleep do we know?", since the article seems to take an obvious jab at it.