I'm sorry, Ragnar, I disagree.
While Ephesians may argue against a place for Satan, as does the rest of the Bible, to say that NLP, Neurosemantics, or Self-hypnosis is the work of Satan is pure speculation.
It's a speculation that many would disagree with. On this forum alone, there have been many Christian PRers (of which I am one) and no one has ever had a problem with self-hypnosis or NLP.
I've contacted an ordained minister and my parish's priest, and neither agreed that hypnosis is satanic or that NLP is such, either.
Below are some threads containing Christian PRers:
http://www.learningstrategies.com/forum/ubb/Forum8/HTML/000549.html
http://www.learningstrategies.com/forum/ubb/Forum8/HTML/000997.html
http://www.learningstrategies.com/forum/ubb/Forum8/HTML/001689.html