This is not a satanic film nor is it anti-religious.

First thing to note, this form of Christianity is not a promoted version but a historical one, one of superstition doctrine that formed the paranoia about witches and symbols of the devil. I mean its a horror movie so its played up as this belief system is correct, validated by the events of the movie, but what plays out is a clearly warning to the corruption of evil where the influence of the devil can destroy all that is good and natural and steal man away from God.

I don't know who these people are that see the witch as anything more than the villain whose evil destroyed a happy family who admittedly though accurately were extreme in their faith, all that came about from letting the devil whisper in your ear is corruption that spread, induced doubt and paranoia and turned a Godly family against eachother till they were dead or gave into the temptations of the devil. This is a warning, this is anti-satanic if it is anything other than just a horror movie in the confines of a calvanist historical framework.