The attack on Lindisfarne Monastery(793 CE) by the Norsemen was not accidental.
At the beginning of the 8th century, there were three major political powers in Europe:

-The Umayyad Caliphate

-The Eastern Roman Empire

-The Franks

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The Franks were literally on the Norsemen’s door steps. In the year of 772, Charlemagne, king of the Franks, and his army destroyed the shrine of Irminsul, the most sacred place for the pagan Saxons. Irminsul was probably a tree, or a wooden pillar.

Charlemagne invaded Saxony and forcibly converted them to Christianity, massacring those who opposed.
Incursions for the Christianization of pagan Germanic peoples have existed before. At the beginning of the 8th century, Christian missionaries cut down Donar's Tree.

(Donar = Thor = Jupiter), Donar's Tree was another sacred oak for the Germanic peoples.
Monks from England and Frankia had begun missionary tours to Scandinavia as well, but the Norsemen responded to this agression by destroying the churches build in their homeland.

They also began raiding the Frankish and English coasts.
The attack on the Lindisfarne monastery was probably not the first, but it was one that had a great impact. This place was one of the most sacred places of Christendom.

The island was called the Holy Island of Lindisfarne or simply the Holy island and it was the host of the one the greatest treasures in Christendom in the 8th century.

So the 'Vikings' were not savages thirsty of raiding, destroying and raping. They just defended their people, homeland and culture. "The Viking Age" was their resistance.