But your logic for norse and catholic is way off.
Just google it. The norse gods and Greek gods have the same root ancestry.
As for the exact customs I can't say.
I view it kinda like how catholic and Coptic are related. Same root, but they were not in contact with each other for long period so had some drift.
To be honest that's the first time I've heard that claim. I'll grant you there are quite a few similarities, and there has probably been some borrowing of ideas from the Romans, but it's far from the same root. You can find a brief, but decent, comparison here http://blog.juliealindsey.com/julie...k-roman-and-norse-myths-by-katharina-gerlach/. I won't reiterate any of those comparisons here.
Other differences between the religions is the fact that Hellenic was a religion, while Norse was more a cultural set of mores. They had their gods, but it's quite likely that worship was more personal and flexible. You could stick with Thor or Odin if you liked to go a plunderin', or if you were more of the farming type you might revere your ancestors, or possibly the elves and spirits of the woods. The Aesir were the universal parts of the religion, while the rest was more personal or localized.
Organized worship was less of a thing as well for the Norse. You had some priests, called Godi, but in general worship was handled by the head of the family / warband / village / farm. Godi were more there as a conduit to the gods, able to ask the gods for favours on behalf of the folk. It's quite unlikely they ever claimed the Hellenic / Christian bit of actually speaking for the god(s), just speaking to the gods.
Interestingly I've seen the Norse name for the religion called "Sejdr", which is an older form of "Sed" which is again an archaic form of the Norwegian word for "Customs".
Source for "Sejdr" was in Illustrert Vitenskap, so it's a paper magazine I can't link to, but the rest is probably sourcable here: https://en.wikipedia.org/wiki/Norse_religion
So, no. It's nowhere near the relation between Catholic / Coptic. It's far closer to Catholic / Islam, parts of the origin match, you have many of the same religious figures, but it's entirely different.
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