With 2.18 billion adherents, Christianity has become a truly global religion over the past century as rapid growth in developing nations offset declines in Christianity’s traditional strongholds, according to a report released Monday.

Billed as the most comprehensive and reliable study to date, the Pew Research Center’s “Global Christianity” reports on self-identified Christian populations based on more than 2,400 sources of information, especially census and survey data.

Findings illustrate major shifts since 1910, when two-thirds of the world’s Christians lived in Europe. Now only one in four Christians live in Europe. Most of the rest are distributed across the Americas (37 %), sub-Saharan Africa (24 %) and the Asia-Pacific region (13 %).

“In two out of three countries in the world, the majority of the population identifies as Christian,” said Conrad Hackett, lead researcher on the “Global Christianity” report. “I had no idea about that. … I was surprised.”

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