It's a typical reaction of those who are hopelessly bound to their superstition, no doubt. Things like research and facts mean absolutely nothing to people like that. Can you imagine what it must be like to live that way?
And what are we to make of the fact that you didn't actually read what it is you're so hot and bothered about? If you did, you'd see the article was specifically about integration processes without regard to what you're trying to inflame here... Look again, if you please.
Also, as a point of reference, Islamic is not a pronoun. The term you're looking for is Muslim. And on that topic, where did you ever get the idea that Atheists are any more comfortable with an extremist prone religion like Islam then we would be with christians? From this point of view, your faiths are quite interchangeable with regard to their respective goals and desires.