I move in circles where most people would find it absurd to believe that humans didn't evolve from prehistoric ancestors, yet many of these same people quite happily believe in astrology, psychics, reincarnation, the Tarot deck, the i Ching, and sooth-saying.I'm not sure I quite get it, either. My impression is that a lot of folks on the left see adherence to Christianity as a proxy for political conservatism, and they shun it. New Age philosophy, meanwhile, is associated with elements of the left, so it's safe. So people are reacting to the politics rather than the theology. I honestly don't know what people on the right think of New Age philosophy, if they think about it at all.
Now just why we'd see creationists on the right and New Agers on the left isn't quite obvious, either. I suppose a charitable explanation would be that folks on the far left define themselves, at least in part, through their rejection of traditional forms of authority. So they reject the faith in which they were brought up, but still have the same spiritual needs (questions about origin, purpose, life after death, etc.) as folks on the right, so they join newer faiths that don't carry the same sort of millennia-old baggage.
Of course, some of these New Age faiths aren't so new anymore. So are the children (or grandchildren) of the flower children adhering to the same spiritual practices, or do they rebel by joining more formal religions, or do they just become atheists or Unitarians or something? Does anyone know of some decent sociological studies along these lines?