Interesting... But the Christianization part is overstated. The Roman Church was evangelizing, arranging alliance via Christian marriages (the Queen/Lady was increasingly a Christian, and officiating inheretances all over Europe.
The Vikings meanwhile were sacking monasteries, churches, and other ecclesiastical structures where gold and other wealth could be found (all of 'em). Some of the Vikings heard the word while working for the Byzantine emperor, but it didn't start to get traction until the time of this eruption. That's not a coincidence. The pagan gods were much more compatible with the Viking lifestyle. The Anglo-Saxon kings picked up Christianity as they expanded into the western parts of Britain, where it had taken hold (in some cases, hundreds of years before). The Irish were the evangelizers, Ireland having been undergoing conversion since before Rome fell.