There will always be more to be said, but I wrote a comment to the similar answer before:Did Christians ever convert to the Viking (Odin, Thor, Loki, etc.) religion?

In short, these two 'religions' were not mutually exclusive each other in the eyes of the Norse people, and the Norse people didn't have any strong incentive to convert Christians in their society as long as they didn't pose a serious threat to their social order based on pre-Christian religion.