Vidrik, There has been very little direct info on what mechanics will be in game concerning religions. It seems they want it this way so as to be discovered in game by the faithful to each religion. Here are a few links with some basic info and lore. Hope they help.
A couple of search terms for google.
site:https://chroniclesofelyria.com/blog/ (religion) site:https://chroniclesofelyria.com/forum/ (religion)