You're assuming that a human being has a better idea than Deity, when human perspective and understanding are limited (like the movie -- in that it does not show us the intricacies of real life), unlike Deity, which is, as you say, omnipotent (and omniscient). I don't think that's an assumption that can reasonably be made. every single human attempt in history to "recreate" the world (the Romans, Alexander, Hitler, etc.) have been huge failures.
I'm not assuming anything; I
know the world can be improved. For instance, if you want a major change, the human immune system could be rebuilt to be absolutely impervious to all diseases. There is zero downside to this, and immense gains. There are countless other such changes that could be made.
Also, I highlighted your key word for you. Their attempts at recreating society have been failures because humans are limited in capacity, both physically and mentally. Creator gods, whether in the form of sentient trees or not, would be capable of running all of human society literally single-handedly.
"James Cameron is a better God than Yahweh"
Don't you mean
David Cameron is a better God than Yahweh?
How dare you, sir! I resent you calling me a Tory.
(OMRLP FTW!)
It did -- until we pushed the world into the Industrial revolution. Except we didn't have prehensile tails. And fangs.
No it didn't, for exactly the reason you pointed out. Pandora is so perfect that the Industrial Revolution would be unnecessary. This is all but demonstrated in the film: there are no problems 22nd century humans can fix. This presumably includes all diseases, vermin, and farming and medical issues of any kind. There would be nothing to gain from application of technology.