Ah yes, let's try to understand and judge metaphysics with the tools of science. It's like a scientist trying to identify the soul or heck, even the source of thoughts by analyzing the brain, and then denying they exist because he can't find them, yet his entire conclusion(s) or even existence and consciousness are an outright impossibility without either.
Lack of ability, right knowledge and advanced tools should not be used as justification to deny something that clearly exists. To do so, is extremely illogical and unscientific. It would be more humble and factual to simply state: We are currently unable to understand or are able to explain XYZ - we lack either the right-knowledge (scientific principles through which they work) and/or the necessary tools.
The fact that homeopathy (cure through astral influence), acupuncture (cure via the body's etheric energetic chakra points), or reiki (cure through mental, astral and etheric energetic transmissions), work at least *some* of the time, and for expert practitioners - most of the time, outright implies that Science simply hasn't bothered to do proper due diligence on these alternative methods. It is in fact Science that needs to prove it to themselves, everybody else already goes to the "witch doctor" when science fails them - including scientists themselves ;-)
I have faith eventually Science will be able to explain all these methodologies.... but to deny thousands of years of their use and survival throughout time (by a factor many times greater than how long "modern" medicine has been around), is outright laughable and a portrayal of the hubris of the current scientific community.