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How would one go about creating a modernized version of Celtic Religion?
I'm working on a (rather far-fetched) timeline where Celtic (rather than Romance or Germanic) civilization dominates Western Europe, and where Christianity and other Abrahamic religions never gained a strong foothold in Europe.
One of the issues I'm having is developing a gradually modernized and codified version of Ancient Celtic religion, similar to how Hinduism is a modernization of ancient Vedic religion.