"Personal Faith" does advance the ability to prosper for the Shepherds for the religion be they Priests, Imams, Rabbis, Lama, Druids or whatever title they want to use and whomever those leaders decide to back in terms of business or politics.
oh and lastly, you can't prove that hell or heaven exists; you might as well tell us that we should watch out from being run over by an Invisible Pink Unicorn and that should we not eat a good amount of pasta that a giant flying spaghetti monster will come down from space to eat us for blasphemy against his noodly appendages. People who live their lives in fear and worship of the non-existent can not even begin to fathom the true wonders that really exist within our universe.
Scott does have a tendency to poke fun at the faiths, including faith in evolution.
This is a common tendency among observation-and-analysis-centric individuals, many of whom are engineers, programmers, scientists, and the like.
One reason they continue with this philosophy is that it has seldom failed them in getting a paycheck, and they can explain/ridicule away anything that doesn't agree with it.
This smacks with ignorance and mental blight. Poking fun at "personal faith" does not advance anyone's ability to prosper. Scott, if you thionk this is funny, just wait until Hell is at YOUR front door, where ya gonna run scotty?