The Blackfoot country runs east from the summit of the Rocky Mountains, to the mouth of the Yellowstone river on the Missouri, then west to the Yellowstone sources, across the Rocky Mountains to the Beaverhead, thence to their summit.

As to spirits, the Blackfeet believe in, or at least tell stories of, ghosts, which conduct themselves much as in our old-fashioned ghost stories. They haunt people in a rather sportive and irresponsible way. The souls or shadows of respectable persons go to the bleak country called the Sand Hills, where they live in a dull, monotonous kind of Sheol. The shades of the wicked are 'earth-bound' and mischievous, especially ghosts of men slain in battle. They cause paralysis and madness, but dread interiors of lodges; they only 'tap on the lodge-skins.' Like many Indian tribes, the Blackfeet have the Eurydice legend. A man grieving for his dead wife finds his way to Hades, is pitied by the dead, and allowed to carry the woman back with him, under certain ritual prohibitions, one of which he unhappily infringes. The range of this deeply touching story among the Red Men, and its close resemblance to the tale of Orpheus, is one of the most curious facts in mythology. Mr. Grinnell's friend Young Bear, when lost with his wife in a fog, heard a Voice, 'It is well. Go on, you are going right.' 'The top of my head seemed to lift up. It seemed as if a lot of needles were running into it…. This must have been a ghost.' As the wife also heard the Voice it was probably human, not hallucinatory.

Animals receive the usual amount of friendly respect from the Blackfeet.
They have also an inchoate polytheism, 'Above Persons, Ground Persons, and
Under Water Persons.' Of the first, Thunder is most important, and is
worshipped. There is the Cold Maker, a white figure on a white horse, the
Wind, and so on.

The Creator is Nà-pi, Old Man; Dr. Brinton thinks he is a personification of Light, but Mr. Grinnell reckons it absurd to attribute so abstract a conception to the Blackfeet. Nà-pi is simply a primal Being, an Immortal Man,[11] who was before Death came into the world, concerning which one of the usual tales of the Origin of Death is told. 'All things that he had made understood him when he spoke to them—birds, animals, and people,' as in the first chapters of Genesis. With Nà-pi, Creation worked on the lines of adaptation to environment. He put the bighorn on the prairie. There it was awkward, so he set it on rocky places, where it skipped about with ease. The antelope fell on the rocks, so he removed it to the level prairie. Nà-pi created man and woman, out of clay, but the folly of the woman introduced Death. Nà-pi, as a Prometheus, gave fire, and taught the forest arts. He inculcated the duty of prayer; his will should be done by emissaries in the shape of animals. Then he went to other peoples. The misfortunes of the Indians arise from disobedience to his laws.

Chiefs were elective, for conduct, courage, and charity.

Though weapons and utensils were buried with the dead, or exposed on platforms, and though great men were left to sleep in their lodges, henceforth never to be entered by the living, there is no trace known to me of continued ancestor-worship. As many Blackfeet change their names yearly, ancestral names are not likely to become those of gods.

The Sun is by many believed to have taken the previous place of Nà-pi in religion; or perhaps Nà-pi is the Sun. However, he is still separately addressed in prayer. The Sun receives presents of furs and so forth; a finger, when the prayer is for life, has been offered to him. Fetishism probably shows itself in gifts to a great rock. There is daily prayer, both to the Sun and to Nà-pi. Women institute Medicine Lodges, praying, 'Pity me, Sun. You have seen my life. You know that I am pure.' 'We look on the Medicine Lodge woman as you white people do on the Roman Catholic Sisters.' Being 'virtuous in deed, serious, and clean-minded,' the Medical Lodge woman is in spiritual rapport with Nà-pi and the Sun. To this extent, at least, Blackfoot religion is an ethical influence.

The creed seems to be a nascent polytheism, subordinate to Nà-pi as supreme Maker, and to the personified Sun. As Blackfoot ghosts are 'vaporous, ineffectual' for good, there seems to be nothing like ancestor worship.

These two cults and beliefs, Pawnee and Blackfoot, may be regarded as fairly well authenticated examples of un-Christianised American religion among races on the borderland of agriculture and the chase. It would be difficult to maintain that ghost-worship or ancestor-worship is a potent factor in the evolution of the deathless Ti-ra-wá or the immortal Creator Nà-pi, who has nothing of the spirit about him, especially as ghosts are not worshipped.[12]

Let us now look at the Supreme Being of a civilised American people. There are few more interesting accounts of religion than Garcilasso de la Vega's description of faith in Peru. Garcilasso was of Inca parentage on the spindle side; he was born in 1540, and his book, taken from the traditions of an uncle, and aided by the fragmentary collections of Father Blas Valera, was published in 1609. In Garcilasso's theory the original people of Peru, Totemists and worshippers of hills and streams, Earth and Sea, were converted to Sun worship by the first Inca, a child of the Sun. Even the new religion included ancestor-worship and other superstitions. But behind Sun worship was the faith in a Being who 'advanced the Sun so far above all the stars of heaven.'[13] This Being was Pachacamac, 'the sustainer of the world.' The question then arises, Is Pachacamac a form of the same creative being whom we find among the lowest savages; or is he the result of philosophical reflection? The latter was the opinion of Garcilasso. 'The Incas and their Amautas' (learned class) 'were philosophers.'[14]