Farren unwittingly, not quite 'follows' Xiosia, but instead, happens to work towards the same goals. He does not worship Xiosia as a deity, he serves Xiosia as a protector of nature. He doesn't say prayers, doesn't actively worships Xiosia, but does serve her with his own goals, and basically runs parallel to her. Very hard to really explain.
I have other characters that worship other deities, including a Black Flame follower that would be the last person you'd expect (aside from maybe Farren

). I do not have a Dakkru follower or even a Talad folllower, but I do have one or two Laanx followers.
Also, Kedhran: Laanx is, or at least was, one of the most 'followed' gods at one time in PS, until they came out with Dakkru and Xiosia. Everyone wanted to be different and follow the new goddesses. I on the other hand simply played my character as he was

Farren is a ranger, almost always has been (I made the Rangers of Yliakum guild a couple months after joining PS) and he protects nature (as a whole, not every little blade of grass and every little critter scampering around in that grass

). He hasn't changed in that respect, simply a new goddess has been added that his goals tend to serve the interest of. If someone claims they are going to attack Xiosia, he may be concerned, but only because he considers Xiosia to be nature itself. Often, he's not really too afraid since he doubts an average person can do very much to nature without getting themselves killed.