Bon is loosely a Chinese religion. Bons concern was basically the same as the Kahuna path, bridging the selves, and only indirectly communing with other spirits. More concerned with their spiritual citizenship, and letting the spirits see to themselves. The Chinese practices regarding the spirits are of Bon origin, even the ritual dragon dance.
Bon is very shamanistic. In a sense, Bon can be argued to not be “religious”. Mantras were a way to attune both the three selves, and to adjust to spirit influences.
“We Tibetans regard Bon as the ancient, indigenous religious and cultural tradition of our ancestors, which is the source and embodiment of many aspects of the Tibetan way of life.” The Dalai Lama