Norway's Roman Catholic population nearly doubled from 2005 to 2011, according to a Statistics Norway report.
The growth from 43,000 to 83,000 can be attributed to immigration — mostly of artisans from Poland.
To help, Roman Catholic leaders enlisted 21 Polish priests and are publishing a Polish magazine.
The (Lutheran) Church of Norway still claims 3.8 million of the country's 4.9 million inhabitants as members. Another 106,700 Norwegians are Muslim.
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