sorry then....I cannot find Mysticism in either the region tab, the guild panel or the technology tab of the help information. The problem I am having is not using the guild tab, but thank you for explanation it will likely be of help to someone, but finding the Mysticism refereed to in the Faithful trait.
My guess is that either I am missing something obvious, I made a mistake installing MOM, or Mysticism got 'displaced' without the Faithful trait being altered to fit.
but thanks for being so comprehensive.
my guess then is like yours : mysticism has been moved / or changed name. But the text in the civilopedia has not changed. (the info that you'll get a Prophet once you research mysticism was wth the word "mysticism" in "white", isn't it?)
/regards