There is no "official" Native American religion, nor should their be.
The American Indian Religious Freedom Act 1978
Forest Service to construct a road onUSFS land, despite recognizing that construction through the cemetery would"destroy the...Indians’ ability to practice their religion." Althougha 1996 Executive Order instructed federal agencies to accommodate NativeAmericans’ use of ceremonial sites and to avoid "adversely affecting thephysical integrity" of sites, Native Americans have nonetheless had tostruggle to protect sites on a case by case basis.
American Indian Religious Freedom Act | United States 
1996) establishes as policy of the United States the protection and preservation for American Indians of their inherent right to freedom to believe, express, and practice their traditional religions.
Religious Freedom for Native Americans
Any regulation promulgated pursuant to this section shall be subject to the balancing test set forth in section 3 of the Religious Freedom Restoration Act (Public Law 103-141; 42 U.S.C.