Here's a thing y’all gotta understand about the Celtic cultures/religions/traditions.
There is no one Celtic language or tradition or customs so please stop using it as an umbrella term for Ireland, Scotland, Wales, Cornwall, Isle of man, France, Basque region and Switzerland . It’s like saying South Asian, its not one country or culture. All these countries have very different languages, mythology and cultures.
There is no one language or religion or tradition for all of them because its literally different countries. What makes them Celtic is the base root for languages and Le Tene art found on the artefacts (and a few other things im not entirly sure of)
Sorry just getting a little frustrated with seeing the word Celtic thrown around the gaff epically when refuting to Irish or Gaelic.
So stop it:)