my quick and rough synopsis...
Dr John F. Haught (from start)
Religious fundamentalism is literalistic. Scientism is a type of fundamentalism & literalism. Both religious fundamentalism & scientism are saying that their is a 'certainty' or certitude. Scientism says takes nothing on faith - yet it takes faith to embrace scientism. Scientific Naturalism is the view that nature is all that there is. You bound your sense of reality with a type of certitude says Haught.
Dan Dennett (from 4min 55s)
Scientism: I don't know anybody who is guilty of it. Scientism is a strawman used by people who object to science 'poking its nose into places it shouldn't be.' Reductionism / Scientism. Scientists are naturalists - methodological naturalists which is just built into the scientific method. That isn't to say there couldn't be supernatural things but the burden of proof is on the person who wants to invoke them - thats methodological naturalism. We are not going to let any scientist say 'well my experiment depends on a supernatural element and if you don't believe in it then you won't get the experiment. We don't permit that - thats completely out of bounds - thats naturalism. Comparing a fundamental religionist with scientism - I don't recognise that person who is supposed to be into scientism!