As one researcher put it:
This project suggests that religion is not just something for a peculiar few to do on Sundays instead of playing golf.
What does this "prove"?
One side would say that there's something dysfunctional about our neurology that makes us believe things that aren't empirically verifiable. For example, the fact that children give up thinking that their mothers can see everything but persist in believing that someone whom they can't see can see everything can be taken as evidence that we simply need to give up belief in what isn't empirical. It's childish, maybe rooted in an evolutionary cul-de-sac.
Meanwhile, the other side says that we seem to be designed to entertain such thoughts, perhaps by the one who wants us thereby to respond to his overtures.
How to choose? Well, this is but one of many factors to consider, isn't it? We think that it's rather hard to keep looking for the means to explain the persistence of human thought about god as dysfunction. Call that epistemological surrender. We've run out of excuses, so we concede to God.