The books are not specifically anti-christian; they are against organised religion, dogma, and the evils these things spread. When you think about it, what right do religious leaders have to interpret "holy" books their own way and tell you how to live your life? Well, they only have the power that you give them. Ignore them for long enough, and the whole structure will collapse. And not before time. Most people who complain about the anti-christian nature of things aren't real christians anyway.

In any case, we had this whole religious nonsense thing in the UK decades ago when "Life of Brian" came out. That film was condemned for being anti-christian, and it was quite obvious to anybody who had seen the film that those complainants either hadn't seen it, or hadn't understood it (or, perhaps, were too embarrassed at the film taking the mickey out of them).