Pantheism that everything is a "manifestation" of God, that is to say that everything is like unto sparks flying from a fire (manifestations flying from the Divine).
All forms of Pantheism hold that the world is God and vice versa. This is impossible because its an impossibility that a cause can produce itself as its own effect. But pantheism states that God [First Cause and Necessary Being] is one with the world, which is a caused and contingent being.
Also the "God" of Pantheism
cannot be God because the true God
is pure actuality. There is nothing that God potentially be, since He is actuality. So God cannot change. Pantheism though, teaches that the "Divine Being" or "the Absolute" or "The Divine Essence" evolves in a series of manifestations and realizations of Himself - i.e., growth in that which is Perfection, improvement in that which is already Infinite and pure actuality.
For more on this I recommend the book
Apologetics: A Philosophical Defense and Explanation of the Catholic Religion which is available at
www.chantcd.com for around twelve dollars.
As for the actual movie, I have not seen it, but I do not think that it is the best interest for Catholics to attend profane shows that are all to often an occasion of sin (previews in the movie theatres are almost always an occasion of sin, even if its a children movie that is the feature presentation!).
I would not be surprised if there were implied and/or subliminal messages in Avatar, seeing that there are plenty of those even in Disney movies marketed towards children...