“As a result of historic missionary activity and indigenous Christian movements by Africans, there has been this change from about one in 10 (sub-Saharan Africans) identifying with Christianity in 1910 to about six in 10 doing so today,”

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 (Dec. 19).

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 percent), sub-Saharan Africa (24 percent) and the Asia-Pacific region (13 percent).

“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.”

The report confirms Christianity’s standing as the world’s largest religion, with 32 percent of the global population. Islam is second with about 23 percent, according to a 2009 Pew report.

A close look at the details reveals a few ironies:

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