1/ Reiki is very spiritual and it does work, but is not divine, not of Jesus, and not of God (John 14;7). Reikians don't  see any difference between angels and fallen angels (1john4;1-4); they are blinded to see the difference between serving God (mat4;10), and serving reiki. Between giving honor to God (mat22;37) and honoring reiki after each healing. They can't discern between God, who is our Father and is the Lord Jesus Christ's Father,  who is so much more then their conception of god; the universe, or cosmos, all there is, and acknowledge reiki as the life-force energy. (gen1;1).

2/ To learn reiki is simple; In every reiki seminar, after payment, the student is led into a seperate room, the reiki-ritual will be preformed to open the student as a channel for reiki, whatherever the reiki-degree. The pupils don't know that there is allready a lot of reiki send to them before the seminar, and this room, and spiritually to the situation. All is endowed with reiki.
The reiki-student and master is unaware that; it is sinful sitting before a home-made altar (idolatry), with photo's of dead reikimasters (spiritualism), various objects, candles, incense (honoring spirits), praying and paying for and accepting reiki, thus authorizing a reiki-ritual performance to open the spiritual doorways for reiki energy and their spirits and afterwards serving in gratitude reiki and his reiki spirits. (serving false gods, Ex 20;1-6)

3/ The daily reiki-practice of  laying on hands, while going more and more into levels of meditation, or on oneself or anybody else, opens new spiritual doors allowing reiki spirits have a rightful access in one life. Permission- authority-sin -more access- more bondage, and if  given a reiki treatment to someone else, a spiritual doorway is opened in the life of this (unaware) person, which thinks is healed like Jesus did, through which the reiki spirits will have, or will make more access, to this persons life.

4/ Reiki works, heals and reveals many things, but after some time, you get in big trouble. After a couple of years, many active reikians and reikimasters turn; mentally ill, having psychoses like experiences  (1 Cor.1;19,20),many are divorced directly after they started with reiki, turn financially broke, or severe sick, mostly after some 10- 15 years of reiki. (rom1;18+21, rom2;5-9). The reiki alliance has a helpline for supporting these sick reikimasters, but no way reiki helps anymore(mat12;30+33).

5/ So, Reiki is sinful, it is using reiki spirits, fallen angels, it is worshipping false gods, it is in contradiction with Gods Word, its healing people on the short term, but leading them to destruction on the long term, its rebellious to God (tit1;16)  Nowadays the traditional reiki mixes and changes constantly, mixing itself with more occult powers, like witchcraft and other powers. Various gurus have embraced reiki adding some of their teachings to it, in order to sell their seminars under their name. Reiki is mixing with esoteric "white magic" in the open and black in the hidden and the higher levels grow into satanism more and more. (mat12;25,26,27)

For more info about what other Christian denominated Churches have to say about reiki, please go to reikidangers.eu, where you can study the untied Christian view on reiki.