If only you understood how many people are dying because of the use of unnatural substances like antibiotics. We have far more effective substances that are natural, and the bacteria cannot become resistant to them.
Bacteria can evolve to become resistant to antibiotics? I don't remember reading that in the Bible.
I'm sure there are instances of people being harmed by the improper administration of modern medicine, including antibiotics. It is laughable to suggest, however, that that modern, i.e. scientific, medicine has cost more lives than it has saved, or that it is even a close question.
Take, for instance, the vaccinations that have effetively wiped out a host of diseases that plagued the world. Those diseases were conquered by applying scientific principles to their study, not by throwing up our hands and saying "God did it."
We have far more effective substances that are natural, and the bacteria cannot become resistant to them.
I agree that there many effective "natural" treatments for disease. But, guess what? The effectiveness of those treatments is only demonstrated through scientific study.