A comprehensive demographic study finds that there are 2.18 billion Christians of all ages around the world, representing nearly a third of the estimated 2010 global population of 6.9 billion. Christians are also geographically widespread, and no single region can indisputably claim to be the center of global Christianity.
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PDF) Global Christianity: A Report on the Size and Distribution of the World's Christian Population
Study notes shifts in world's Christian population / Christian Science Sentinel
Christianity, Ultimate Pop Culture Wiki
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Share of global population by religion 2022
Nineteen Sixty-four: Yes Virginia, there are still Christians (including Catholics) in Europe
PDF) The Trend to Discriminate Christians: Shifting from the 'Post-Christian' West to the Global South