Not true. Baum and his wife were practicing theosophists.
Baum's mother-in-law, Matilda Joslyn Gage, was a radical lesbian feminist who traveled with the Baums and influenced them daily. Baum said he even named the main character of his later books, Princess Osma, after Gage: Matilda Joslyn Gage.
This from the horse's mouth...
There's a much darker story behind the green curtain than most people realize.
But, hey, they're just words. And as we've been told, words have no power, right?
Dr. E, I know that you are well versed on these things, so I have to defer to your knowledge. Thanks for posting.