The book that originally lead to my conducting my first "experiment"
...[I use air quotes as I considered these experiments in a scientific sense and tried to, in my own mind, be as methodical and scientific in my approach as possible at the time, but recognize that such experiments would hardly qualify as being either "scientific" or above criticism as being "experiments" by scientific standards] ... was The Law of The Higher Potential by Robert Collier. AS I think I already mentioned.
Collier's work is considered to be or has been embraced by "New Thought":
http://www.newthoughtlibrary.com/collierRobert/
I'm not without some familiarity with the movement or its publications. Ditto Unity.
While there is little to be criticized in these movements, there is a degree of religiosity that goes slightly beyond what I would consider my limit. The language generally applied to causal phenomenon like "God" and "Prayer" tend to be misleading.
I've read them. I don't endorse the use of affirmations. In general they are a rather lame substitute for actual control, used by those too weak to confront their own "dark side" and so make an attempt to bury and smother their own doubts and fears by painting them over with "affirmations". What Hubbard did on his own time is his business.
Crowley was not so much a "Black Magician" He was a "scientist" [air quotes again] who endeavored to put all varieties of spiritual practice on a scientific footing. That is to get to the bottom of what made it work. If it worked at all. In that sense the methodology of Christian Prayer is identical to the methods of Witchcraft or "Black Magic". Things like "Unity" and "New Thought" stand as an example.
Crowley practiced ritual magick but his intent was always to uncover underlying scientific principles and isolate them. You would be as likely to find him counting the rosary as sacrificing a cat. His inquiry was always 'why should any of these varied superstitious practices ever produce any sort of result whatsoever ?' .
As I recall, I told Hubbard, If you want to start a religion to make money, you might just as well make it the truth.
He must take full credit for Zenu and various other nonsense he couldn't resist inserting.
Anyone with half a whit could sort out what's what without much trouble.