So in order to become a Gaulish Polytheist one must have these basic understandings.
- One must have Gaulish Gods (Dewôi)
- A structure for basic ritual
- A calendar with holidays
- An altar
- The Virtues.
There’s a lot of Gaulish Polytheists who’ve helped recover or develop all of the above, so there are plenty of options. You can check the Other links on the site to find a lot of that.