匿名官员的话可能带有偏见，因为它没有提供具体的数据或案例来支持其说法，需要进一步核实。

This is a bias statement since the word "unscientific" signifies that spiritual healers are incompetent in treating diseases. It is a discouraging term that would define an inefficient role in healing.

To correct: We could state it as "One significant component to the spread of disease was the dependability on spiritual practitioners wherein methodologies rely on utilizing medicinal plants and mantras which resulted to an opposition to modern medical procedures."