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WI Christianity gets an early hold of Scandinavia. Similar to the way Armenians and Goths converted.
My idea for the POD would be a more succesful roman campaigns in Germany, going further north and even putting bases into south norway and sweden. Then later on they lose Germany but keep these small bases for a 100 years longer but abandon them eventually.
A more cultural contact between Rome and Scandinavia leads to influences on the culture and missionaries.
So how would things turn if instead of being pagans the Vikings would´ve been gnostics or arians?