We know very little about the Viking. The one truth we know for sure is that we don't know the truth about Him.
Norse Culture was an oral one and the only certain written sources left by the Norse peoples of the Viking Age are runic inscriptions. Most of these are in the form of runestones. The inscriptions on the runestones are generally very short, often hard to decipher and are nearly always written to honour a person responsible for something worth remembering by the local community, to honour someone dead, or to mark the ownership of land. Other sources often thought to be of Old Norse origin, such as the Poetic Edda or the Icelandic Sagas, are either of uncertain age, are written after the Viking Age or are based on oral tradition.
An author such as Snorri, which is considered an authority on Viking Religion and Culture, lived long after the Viking Age was over, during the High Middle Ages, in quite a different world, which followed other rules and another religion. He also has his own, sometimes quite obvious, political agendas.
All other sources which are considered valuable for our understanding of the Viking, such as the testaments of British monks or the German bishop Adam of Bremen's writings, are written by people with a long distance both geographically and culturally to the phenomenon they are describing. They are also to some extent hostile towards the culture they are describing or have an interest in describing it in a way that fits their own purposes. They are also describing the Norse culture from only the small sample of the Scandinavian population that they or their Brothers of the Cloth have come in contact with.
The Viking is in many ways a mystery to us. This is one of the reasons that He has been so used and abused by different groups and individuals with unscrupulous agendas. They can use the Viking as a slate on which they project their own ideals, goals and values.