I did some research on Reiki just recently, and this link explains how Reiki started: http://scienceblogs.com/insolence/2009/0…
“Reiki is definitely not supported by any scientific evidence, and it is definitely not based on Christian religion. Rather, it's based on Eastern mysticism… In fact, there are a great many similarities between reiki and faith healing. I refer my readers back again to a famous reiki website to show why. There, I found a concise description of the history of reiki "from the horse's mouth," so to speak. There you will learn about Dr. Mikao Usui, the founder of reiki. It turns out that Dr. Usui's quest to learn how to heal was inspired by Jesus himself when as a student he asked his master if he believed that Jesus had healed. He answered yes. Dr. Usui then asked him him how Jesus healed, and he was forced to admit that he did not know. According to reiki practitioners, this led Dr. Usui on a spiritual quest lasting decades to find out how to heal as Jesus did. This quest ultimately culminated in 1922, when, like Jesus, Dr. Usui engaged in fasting and praying on a mountain in the wilderness, described thusly:
After a few more years of study, he felt he had come to an understanding and that to go further required serious meditation. He went to a nearby mountain declaring his intention to fast and meditate for 21 days and that if he did not come back they should come and get his body.
He went to the mountain and settled in with 21 stones with which to count the days. On the 21st day nothing had come as yet, and he turned over the last stone saying "Well, this is it, either I get the answer today or I do not". At that moment on the horizon he could see a ball of light coming towards him. The first instinct was to get out of the way, but he realized this might just be what he was waiting for, so allowed it to hit him right in the face. As it struck him he was taken on a journey and shown bubbles of all the colors of the rainbow in which were the symbols of Reiki, the very same symbols in the writings he was studying but had been unable to understand. Now as he looked at them again, there was total understanding.
After returning from this experience he began back down the mountain and was, from this moment on, able to heal. This first day alone he healed an injured toe, his own starvation, an ailing tooth and the Abbots sickness, which was keeping him bedridden. These are known as the first four miracles."
The transference of spirits can happen during Reiki healing – it’s the demon of the ‘Shakti’ touch and has been going on for centuries. Here is a link that answers the question, ‘What does the Bible say about energy healing / energy medicine?’ http://www.gotquestions.org/energy-healing.html
When Jesus instructed his disciples to heal the sick, raise the dead and drive out demons, he said “Freely you have received, freely give.” (Matthew 10:8) This is an important principle in deciding whether healing is from God or not. Finally, please ask yourself if this healing does not come from God, then where does it come from?