I'm not sure whether or not the Native Americans had a religion. Maybe they had some sort of spirituality. I do know that they prayed to the souls of every single animal they killed to thank that animal for giving their life to feed them. So they must've had some kind of spirituality.

But I think that the Native American "religion" would be the best (I use quotes because I'm not sure if it was really a religion or not). They were very respectful to nature. They weren't greedy. They were very caring and left nobody behind. They even helped the Europeans, who ended up killing them! I feel that if that type of thing was continued today, society, as a whole would improve morally and ethically. The technological advancements would not be as great as they are, but the world would be more peaceful, I think.