Scientism

Scientism is not just being very Scientific; it is the mis-application of Science.  It's pretty much the tendency to use Science-like thinking for everything, which can get to be a problem.  For example, there's really no reason to believe that methods that work for matter also work for intangible, trancendent, or spiritual things.

The problem for the Scientism-ist (sorry about the word) is dismissively convincing themselves that most of the civilised people that ever lived, and most they meet, are either morons or insane.

Scientism is the opposite of Over-Spiritualizing, in that it overly dismisses or overly simplifies things that can't be explained.