I believe that the Nacirema practice magical beliefs because they believe that the human body isn’t strong enough on it’s own, and can help it, by using magic to achieve it. They continue to practice it because it is their tradition, and has been apart of their culture for countless years.
The overall, “the fundamental belief underlying the whole system appears to be that the human body is ugly and that its natural tendency is to debility and disease.” Due to the fact that humans are susceptible to sickness, the Nacirema believe that with these potions they have created they can ward off demons and sickness. They believe this to be true by creating people to solve these problems; medicine men, holy-mouth-men,