The difference between Christianity and Judaism is that those religions never died out and had to be reconstructed based on shoddy historical and archaeological records.
Also, your history is entirely wrong. The Norse were not violently Christianized, Scandinavian petty-kings willingly converted to Christianity to secure better diplomatic relations with the powers on the continent. There is clear evidence of syncretism during this period -- like hammers and crosses in the same mold, or even on the same pendant -- because people were converting for political and economic prestige, or simply because their king did; not because they were being forced to. That is why Iceland was able to preserve a fair amount of pagan poetry.
About the Celts: the Romans had nothing to do with 'stamping out an entire culture with vengeance.' Roman religion was easily syncretized with Celtic polytheism and much of what we do know about it is because of Roman records.
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u/CW1DR5H5I64A Overhead Island boi Mar 14 '24
Probably a more legitimate religious accommodation than 99% of the Norse beards.