In connection with this particular topic, I think “The Great Spirit” of Native Americans was (and is) the one true God, as much as He could be understood by the simple people of that pre-Christian time and pre-colonial place. And before Native Americans could crowd the New World, and form empires, and mix all their diverse gods and religions together and become true polytheists, Europeans put an end to the process forever, and inadvertently ensured that Native Americans never lost their faith in that one simple, elemental creator being.
Out of all the tragedy and bloodshed of the European colonial legacy, that is the one priceless benefit bequeathed to the world–an affirmation of the most ancient kind of faith in one God, preserved like a time-capsule down to the present day.
One problem: doesn’t exist.
Okay, actually, the Ojibwa
might have one, though “Great Spirit” (Gichi Manidoo) is probably just how the missionaries translated “God”. Wakan Tanka, the Sioux equivalent, means “Great Ineffable”, and has a lot more in common with the Platonic concept of the Realm of Form than anything we’d recognize as God (conceivably the Monad, the Form of the Good, might be in there somewhere, but…).
Out west? Nothing doing. The Hopi have no such thing; their cosmology is basically the Aztec religion, only exorcized (and not emanationist-pantheism). Their chief gods are the Sun (who’s about like Mars in pre-Hellenized Rome, or the light-god of Slavic myth) and Masauwu, the Skeleton, god of death and fire—and who, I kid you not, dragged himself out of the pit of fire where dead sinners are tormented. Nice guy, though. Other than that they worship a pantheon of weather gods, the Kachinas.
Navajos have a weird mix of their original Athabascan myths with something that might be Hopi gods, or possibly something older; their myths say their gods heard them approaching and
came down out of abandoned temples to give them a law. Their religion has a high ethical tone—its philosophy is similar to Taoism—but the closest thing they’ve got to a creator-god is First Man, who’s also the First Witch (and witchery, to Navajos, means stuff like incest and necrophilia, done purely because they’re wrong; that’s where the power or “corpse poison” comes from).
I don’t know who that Yaqui guy was but apparently, the Yaqui religion is more or less dead—they’re almost all Catholic now. A lot of “Native American” religions are less than scrupulously accurate revivals, nowadays; think Wicca, or modern Druids.
You want a better priceless benefit bequeathed to the world by the European colonial legacy? We made the Native Americans give up slavery. And torturing captives to death.