A little melodramatic isn't it? Put your sword away. You cannot give up now. Your mission is to do whatever it takes to secure your position. This means accepting Christianity and rejecting the urge to become a warrior.
You govern a great deal of land, but you need the approval of the King of Norway. Go to him and appeal for consent. Do whatever it takes to secure your title.
There's plenty of land still to fight for. You are developing a real feeling for raiding and pillaging. Why stop now?
Play a card