This article could have appeared in satirical pages of The Onion but it is an actual editorial that appeared this week. It is the idea of western pluralism taken to absurd extremes. If pluralism is so pluralistic that it can't place blame on axe-wielding murderers but rather on their victims, then it can't survive.
As a religious person, I would like to state for the record that I'm offended by the author's supposed defense of religion. Set aside for the moment that the term "religious people" lumps together radical terrorists and people like me. If religious people can't be expected to act rationally, to accept criticism and satire of their culture, without resorting to murderous violence, then they can't be defended.
The author's vision of the religious/secular divide would make it impossible for religion to exist in a pluralistic society. This is how pluralistic/liberal societies consume themselves and become anti-pluralistic: insisting that anti-pluralistic, anti-modern, anti-democratic violence is a legitimate political expression.