Conversely, films like Avatar and more hard fantasy like Harry Potter embrace the notion of the supernatural. The characters don't tend to debunk the supernatural but latch hold of it. In Avatar's case, the goddess of the forest is eventually found to exist and is supernatural even by the visiting humans.
Untrue. Ewa is entirely explainable in scientific terms with no recourse to the "supernatural" required.
, Ewa is simply the super-consciousness of the combined Pandoran ecosystem. The technologically unsophisticated Na'vi may worship this super-consciousness, but in terms of reality it is akin to the natives' worship of Vaal in "The Apple", or the Bajoran Prophets. Actual beings that relatively primitive people have elevated to the status of divinity in some fashion.