A Gifted Man
When he performs his shamanic ritual, he borrows heavily from Native cultures. Holt lies on a Navajo-style rug. Anton waves a feather and a rattle over him. He invokes the "Great Serpent" of the South, which I think is a Mesoamerican reference. And he says "Aho," which means "thank you" in some Plains language.
There's a debate over whether it's proper to call any Native priest or medicine man a shaman. Since Anton doesn't claim to be Native, this isn't (quite) a problem. At least he does what a shaman traditionally does: intercede with the spirits of the dead.
I guess the problem here is the jumble of Native references: the rug, the "Great Serpent," and "aho." It would be better if A Gifted Man stuck to one indigenous culture, or didn't use indigenous references at all. At the moment, Anton seems like a typical New Age wannabe who calls himself a shaman.
For more on shamans, see MUKTUK WOLFSBREATH Revived and Indian Religion Isn't Shamanism.
Below: Pablo Schreiber (Anton the shaman).