I have an idea similar to yours, Edge.

To me, FFVII is about the widespread deterioration of spirituality and natural harmony, as a consequence of humanity's recent preoccupations with industrialism, corporatism, and consumerism; and about rediscovering, albeit with considerable suffering or struggle, one's spiritual/natural identity in such a world. Though there are a number of powerful sub-themes, they all seem to play into this main one...conveyed through quite a psychedelic experience, in my opinion.