There is no reason to suspect Viking involvement, other than the fact that it was dropped somewhere where it shouldn't have been. Fumbles and the Vikings go hand in hand, but that is not enough to prove guilt here! Where's my lawywer!
What if I were to tell you that next to the prayerbook was found a boarding ticket for Al & Alma's Lake Minnetonka Cruise? Hmmmmm?
There was also found disgusting preserved pickled fish.
That can mean only two things: Vikings or Jews (and the Jews wouldn't have left this behind).
I strongly suspect alchohol was involved.