Apparently swaying with your hands in the air can trigger an actual physiological change that can put one in a trance state or something similar, so it probably feels like a religious experience but is just some funny wiring in your body, like the way rocking can release calming endorphines. Confusing neurology/endocrinology and religion can be a dangerous thing ... same goes for mass hysteria and mob psychology.

RC high-five! Unfortunately I was subjected to this at a Youth Mass!