...it is?
I found it hopelessly nihilistic and self-defeating as a moralistic tale; the big moral struggle is against Original Sin, but it is framed in the end in some New Sin instead.
It only made sense to me as a story about one monolithic Authority being replaced by another, which institutes rules to try to prevent themselves from being supplanted by the same means in the future.
The big moral struggle is against GOD. In the end, they kill god, and then save the universe by having sex, ie by denying puritanical prudishness. Then society goes on to live happily after without god's pernicious influence, instead of everyone living happily in heaven.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.