Of Neglected Traditions: Comics Starring Native American Heroes & Thanksgiving
2. Similarly, each issue contains a definitive element of the supernatural, often contrasted by science, as if Native American culture is a source or beacon for all earthen spiritual phenomena.
You probably could find supernatural elements in the vast majority of Native-themed comics also--especially superhero, fantasy, and horror comics. I don't know if Indians are more religious than non-Indians, but they may wear their religion on their sleeves.
In other words, they may talk about religion more and relate it more to the world around them. This makes them seem more spiritual, which leads to the usual fiction about shamans, evil spirits, and burial grounds.
For more on the subject, see Comic Book Featuring Indians.
Below: SHOWCASE #85 and TUROK #1 (not the issues reviewed).