Claudia Llosa explained many times why she made this film (It doesn't matter if she IS Peruvian or not... anyway, she IS.
It's not a documentary. It's not a mockumentary. It's not a portrayal of reality. It's not a film to raise racial prejudices. It's not a film abusive of the people portrayed on it.
It's this crazy idea (a script idea that came out of a "dream") of what would it be like if a town (BTW: Manayaycuna actually means the place no-one-can-enter and is non-existent) believed that during three days there's no sin, since "God is dead".
Better approach it with the motto of "it's just a film, it's just a film"
It's a difficult film to watch, but, nonetheless, a work of fiction, so don't take it so personal. Some filmmakers in the world, and some writers -as I do, have found this film remarkable in many aspects.
When I read a comment calling names to whoever chooses to watch this film just for that decision... well, that person shouldn't be allowed to post here!