I went to the Church of Religious Science for a while, as well as other not so church like groups and whether or not the services are intended that way, it has become clear to me that people go because they want to feel good. It is also pretty obvious that it is extremely rare to find what you might call spiritual/Godly people that can distinguish between this impulse to want to be nurtured (and I also think of nature/nurture) and spirituality in any other sense. If spirituality is about our nature, then what most groups are doing for the most part actually does not address that and is instead largely concerned with nurturing and conditioning.
And one of the things I've found is most religions have no interest in the individual becoming mature, if anything their idea of maturity is becoming more firmly conditioned in the values they teach - but that's just being set in your ways. This seems to be so ubiquitous that people can't seem to even imagine anything beyond living by a specific set of values, as if we're just machines with the goal of perfectly following this code of instruction.
Anyway, I think it does have to do with a social need, or wanting a combination of spiritual and social need if you like. From what I've seen though very few people actually qualify as an authority. Even when there is something a little deeper it most often turns out it's a form of illusion, but it feels good while you're immersed.