Conversion took place from the 8th through 12th centuries.
The vikings did not celebrate Christmas, as they were not Christian. However, they had a holiday that occured around the Winter Solstice, called Yule, or Jul, which Christians "borrowed" heavily from. The Christmas you celebrate is nearly identical to the Heathen Yule, complete with the decorated tree, wreathes, etc.
Because they felt like it
Mostly from pressure from their kings.
The Vikings originally had their own Gods, however, later they did alter to the Christian religion and became pagans, christians. They also adopted the Roman alphabet.
The same way everyone else does. By melting it.
Your question doesn't make sense. Christians don't change colors.
Norse MythsAnswerthey were Christians NOtheir religion was Norse mythology. Some of their gods were Odin, Thor, Loke and Frøy.
We are asleep in the lord and we turn to dust.
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wrong
In the European middle ages, all the kings, except some in Islamic Spain, were Christian and like other Christians were permitted to marry only one woman at a time. That did not stop some from having mistresses, but that is an entirely different thing.
The Vikings!