I wish I could help you there. I am no expert, but I can tell you from personal experience, you probably won't easily find that kind of information in print. I would guess that it does exist somewhere, but Native American belief systems mostly existed without the written word. If we are lucky, someone did write down the religious beliefs, but since the motivation for missionaries was to eliminate the indigenous traditions, it isn't likely. Also, what
was written, was mostly biased. (The word "savage" was used a lot.)
Yes, people do have a good idea of what the beliefs were, though much of it was lost, as the languages were also oppressed. You are correct that the beliefs differed widely, and some did have a feminine "ruling" so to speak. Many Native Americans hold these traditional beliefs to be sacred, not for public view. Hence the difficulty in finding them. A book called "Black Elk Speaks" gives a description of the Lakhota practices and ceremonies, however I got the feeling in reading it that a LOT was left out, changed, or even deliberately inserted in order to prevent sacred ceremonial secrets from falling into the wrong hands. (Just my own feeling)
You might be able to find something when looking up:
The White Buffalo Calf Woman (Lakhota Tradition)
or
The Corn Maiden (Which I have heard as Plains and West Coast, but have not studied)
Coincidentally, I was surfing the net much earlier looking for something else the same day you asked for links, and had come across this one:
Powows.com
I am posting it because it may give you a good idea of how the Native American culture is today.
I have seen a great deal of serious effort to oppose the mixing of traditions with the New Age movement. Just because there are shamans who bring their practices into the mainstream, doesn't mean everyone is ok with it. There is an unspoken overtone of "Don't ask questions, you will find out what you need to know when and if you are supposed to know."
If you do come across something, even a good book, please share it with us.