DM, if you look at the bottom of the page in your link, you will see the name of the author, Jhenah Telyndru.
She founded her own "tradition" (if we can call it that) and here's a link for her site:
http://www.sisterhoodofavalon.org/
Not saying it's valid or not, fluffy or not, but it's a path....not my path....but a path.
Look up, READ MY POST, then please give the same link again......

I looked up all the information I could find on Avalonian Tradition. I even went back to some of the texts I have that I had to translate to English. This "sisters of avalon" and their "avalonian tradition", well they seem to be the only ones aware of it. In fact, if you read their manifesto you will see they are basically doing the Dianic thing with a celtic flavor. They are also the only ones that I can find that aknowledge or even know what the heck the Avalonian pantheon is. I mean seriously if they wanted to create a kick off of the "Western Mystery Tradition" they didn't have to add fiction and legend to do so. They should however, try to at least follow "WMT" traditions and such if they are going to claim that path as a form of teaching. All in all after reading their "core beliefs" I find nothing about them to be based on any facts. They've just picked a bit of this and a bit of that and have made a religion, path, teaching from it.
I mean seriously, at least we admit Discordianism is a joke religion.
I tend to see in most of the "traditions" started within the last 20 years that they are nothing more than people wanting to make their own rules because they just couldn't follow the ones that are part of the traditions already out there. Or they did not move up quickly enough in the chain of command, or some just want to be in such complete control they make up their own thing.
As for this site naming Arianrhod as a goddess, well I wasn't included on that decision, I presume whoever made it did so out of kindness or possibly ignorance. To be brutally honest the Celtic traditions can be a complete conglomeration of many things half of which may or may not be based on any facts.
While the discussion of Avalon, Arthur, Merlin and the sword can be an amazing one, it still falls down to being based on legends which may or may not be based on a lot of truth or very very little. It's a fascinating subject. Hell, why not base a religion on it. Look at Trekkies or Scientologists.
None of this changes my original response that I personally do not consider Arianrhod to be a deity. I was not rude, sarcastic (as is my normal MO) nor nasty. The response I got was unacceptably rude. I have my downfalls but calling someone a mental patient practicing wicca has yet to be one of them.
I've been extremely respectful of other's valid paths here.