There are 2.18 billion Christians around the world, up from about 600 million in 1910, according to a 2011 study by the Pew Research Center’s Forum on Religion & Public Life. But the world’s overall population also has risen rapidly, from an estimated 1.8 billion in 1910 to 6.9 billion in 2010. As a result, Christians make up about the same portion of the world’s population today (32%) as they did a century ago (35%).
via Number of Christians Rises, But Their Share of World Population Stays Stable | Pew Research Center.
