Religion has a long history of struggling to reconcile reality and belief, to find humanity’s place in a largely unknown and complex and frequently hostile universe. If there is any saving grace in faith at all, it is that it is an attempt to find a rock of certainty in the unpredictable chaos of life — it is aspirational, a search for truth. As such, religion changes over time. It evolves.
Where it fails is when people […] give up on the search and the struggle and decide that they have an absolute lock on an irrevocable and ultimate truth, one that will no longer bend to the evidence, that will no longer care about the nature of reality, but only the nature of one antique interpretation of the words of a book. They will not change any more. They will cling stubbornly to this one unmoving stone of dogma, and they will insist that everything else is wrong. They will close their eyes and grasp tighter and tighter to that one illusion of certainty as it crumbles around them. By refusing to bend, they commit themselves to someday breaking.
PZ Myers on faith.