Society can't change overnight, baby steps. As the tool of science expands our knowledge the realm of (the) god(s) decreases, but we're dealing with thousands of years if not tens of thousands years of religion in society from the shamanistic to today's organized religions. It will take at least a few more generations to overcome this inertia. I think those that accept the theory of evolution as the explanation for the diversity of life while still believing in a god or gods is a positive step, and we shouldn't be so quick to browbeat them for still believing in a god or gods.
Think back when you were a Witness, if someone took a hostile attitude with you, called you an idiot for believing what you believed what happened? Most of the time you put up your conditioned defenses and shut out whatever valid points this person may have had. Same with this, you attract more bees with honey than with vinegar. Then perhaps next time when Cyril and his followers come to burn the Library of Alexandria, and flay Hypatia's skin with abalone shells there will be people to stop them.