This is an interesting question and the answer is based on what your individual understanding of what “worship” means. Worship can be defined as a show reverence and adoration for (a deity); or honor with religious rites.
For many American Indian people our connection with the Creator, spirits, nature or other practices can be considered a practice of worship. Some American Indian people practice religious practices and some don’t. Some American Indian people practice a combination of religious doctrines.
Spirituality is an individual experiences and we have many ways we do this and many terms to attach to our practices.
I hope that helps and best of luck!