So we have to use our human values, our own sense of good or bad, or right or wrong, to distinguish an admirable return from the mountain from a lunatic one. We seem to be irretrievably in the domain of ethics here. And it would be impossible in a brief compass to assess the harms and benefits of religious belief, just as it is hard (although not impossible) to estimate the benefit or damage done by belief in magnetic therapy or Feng Shui or whatever.
