Interpreting "Spirits", or "Gods" as physical creatures is completely missing the point, which is to attempt to describe natural phenomena in terms of human personality. Personality is more understandable to people in general than the numerical measurements and relational formulae that are the currently trendy ways of describing nature. Complaining that there are no observable physical creatures out there making rain, or whatever, is like complaining that there are no actual physical numbers or physical laws in nature, just observations, and that therefore science is nonsense.