Uh... but Avatar doesn't have any spirituality. It's just people born with the ability to plug into a planetary, organic, computer network. There's not spirituality involved.
I disagree, and fortunately, to make my point, Merriam Webster disagrees with you also:
Main Entry:
spir·i·tu·al
1 : of, relating to, consisting of, or affecting the
spirit : incorporeal <spiritual needs>
2 a : of or relating to sacred matters <spiritual songs>
b : ecclesiastical rather than lay or temporal <spiritual authority> <lords spiritual>
3 : concerned with religious values
4 : related or joined in
spirit <our spiritual home> <his spiritual heir>
5 a : of or relating to supernatural beings or phenomena
b : of, relating to, or involving spiritualism
: spiritualistic
There is a great deal of spirituality involving the planet, the way the Na'vi interact with Eywa (their God). This falls under definitions #1, #2a & #4. It qualifies under the first definition because the communication between the Na'vi and those who have died is a corporeal to incorporeal communication.