They were obviously NOT using any real Indian language

Whatever makes you claim that? Nothing I've read or heard about this movie hints in any way that the languages are gibberish. Yes, they did use real languages.

If they aren't authentic, it's fooled me, and I have attended many powwows throughout a three-state region. I've heard various languages spoken.

I couldn't find the things I read, or I would copy and paste. So, they used French but made up the rest of the languages? That doesn't make much sense.

*** The trouble with reality is there is no background music. ***

Given how many Native languages exist, and that this was filmed with real Indian extras (for a change), it's more likely that you simply haven't heard this particular language before. You might want to read this. http://www.cogsci.indiana.edu/farg/rehling/nativeAm/ling.html

Given how many Native languages exist, and that this was filmed with real Indian extras (for a change), it's more likely that you simply haven't heard this particular language before. You might want to read this. http://www.cogsci.indiana.edu/farg/rehling/nativeAm/ling.html