They didn’t become Christians until the late 1100s and 1200s. Christianized Vikings did not raid “just as much.” Whether the reason for the decline was economic or religious, one can argue. The transition took nearly two centuries—more than most places in western Europe. Along the way, a lot of half-Christians Vikings did what half-Christian/half-pagans might be expected to do.
But you can attribute it all to economics if you wish. Religion superstructure, economics substructure and foundational—good Libertarian or Marxist theory, take your pick.
So any Viking who raided after Christianity came to Norway was only half-Christian. Wow -that cut incidence of raiding by Christian Vikings 50% in one fell swoop - or is it 100% by your method of calculation!
If you were smarter or knew anything interesting you might be amusing. Libertarian or Marxist!! Pffffft!!!!!