DuBois also shows how Norse religion was never a monolithic or static phenomenon. Central elements of the cultic traditions of one town might have been strikingly alien to the town in the next valley, not to mention another settlement hundreds of miles away across the ocean. Differences across time might have been even more marked. All of this makes it a bit imprecise to even speak of a unified “Norse religion.”

https://norse-mythology.org/book-review-nordic-religions-viking-age-thomas-dubois/

I read this book, quite a long time ago.