... because it doesn't matter what the evidence is, you can argue until you are blue in the face, all that matters is that people want a happy ending and fit in the group, that and Atheism is just too depressing!
As an agnostic, I've wondered why God (if He/She/It exists) hasn't intervened when massacres occur, but aren't great artistic works a product of the mind of the Universe, or God? But as far as modern religion goes, believers will subconsciously discard all scientific evidence contrary to their position, it's called Cognitive Dissonance. Do they want to be ostracised from their cliche/group? No, so they will go with the crowd, even if something nags constantly at their subconscious. Admittedly, this makes for a society that is easily controlled, but our evolved patchwork brains are not perfect, they can be manipulated. (Even a terrorist is selfish, I don't pretend to know all of their motives, aren't they still expecting a wonderful afterlife?)
Am I guilty of cognitive dissonance? Yes I am, just like every other human, even all those know-it-alls that don't have a clue.
The 2nd scariest group of people in the world are those who are absolutely certain of everything because some ancient source of information is supposedly infallible. The absolutely scariest are those who are absolutely certain of everything and that realize how "hackable" the 2nd group is, especially if they use their own emotions against them! I'd put the handlers of modern politicians in the first group, whoever is controlling the message is an absolute threat to democracy. Our society has been their playgound for far too long, we should be evolving, not DEVOLVING!