Vikings

From this period the most interesting culture for me was the Vikings. Because of television and movies, I used to have the idea that Vikings were drunken men with long beards and funny hats always sailing in the sea in big boats. But the truth is that they were much more than that. The first thing that surprised me was the fact that their culture lasted over 300 hundred years. By terrorizing places that were not well defended, they were able to subdue an area and settle down with their own people. They would remain in that area sometimes for several years and sometimes forever. They always targeted places that were full of riches and at the same time were weak and easy to conquer. They ended up conquering and settling down in places from Kievan Russia, Iceland, Greenland, Ireland, Scotland, England and France.
The Vikings were polytheist in the beginning, but once their royalty began to convert into Christianity, most of them became Christian. Once again, Christianity was so powerful that could take over a strong culture like the Vikings. My question is, did the Vikings change their ways of conquering and terrorizing people once they became Christian? Or was Christianity just a new shield to protect their culture?