When we compare apples to bananas we will never make sense of anything. The roots of shamanism predate the scientific model. Furthermore, the means and methods of shamanism is to deal with spiritual assault spilling over into the physical realm via the manifestation of a disrupted psyche. Thus the means for shamanism is spiritual and the method are spiritual. Modern medicine was developed post scientific model with the understand of human physiology, organic chemistry, hormones, genetics, etc... Using the scientific method, modern medicine focuses of treating the physical through physiological or chemistry. So as you see both institutions lay claim to improving the human but each do it from their own vantage. Modern medicine is apathetic spirituality because t is a realm if it exists we lack the instruments to measure, and therefore without the instruments we won't have the measurement and without measurement we don't have data and without data it can't be scientific. So no data and not real is the conclusion. Yet, we see there are many things in which science haven't been able to measure. Maybe someday we learn there is a different dimension where our consciousness/essence goes. To me, I am open and less strict due to my experiences.