This practice probably had its origin in a chance coincidence and then later developed into a complex mapping exercise. Evil spirits can use such 'illogical channels' to give information that eventually grafts people into an occult belief system. Part of the attractiveness of alternative medicine is that the side-effects are generally minimal, however there are some exceptions. Chiropractic manipulation of the neck can be associated with vertebral artery thrombosis and lateral medullary syndrome. Acupuncture can cause pneumothorax and infection.
Herbal therapies are probably the most dangerous.
One of the main dangers of such remedies, even if they don't have toxic effects of their own, is that they delay diagnosis, produce a false sense of security and may interact with other prescription drugs that the patient may have obtained from orthodox sources. This is not a guarantee, as clearly many occult devices stand the test of time, but we can be equally sure that something which does not genuinely work and is not of God will not stand the test of time. Applying the tests As an example of applying the tests above let us consider homeopathy. First, there is no clear evidence that it actually works. Third, it is based on a pantheistic world-view with the concept of 'vital energy' playing a prominent role.