The Size and Distribution of the World's Christian Population

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.

List of Christian denominations by number of members - Wikipedia

Home, U.S. Religion Census

MAPPING THE CHRISTIAN POPULATION A Report on the Size and Distribution of the North Africa, Middle East, Arab Gulf and Central Asia Christian Population. - ppt download

Orthodox Christianity in the 21st Century

US adherence figures by county (2010)

How religious will the world be in 2050?

Christian Population Worldwide - Vivid Maps

PDF) World Christianity and Mission 2020: Ongoing Shift to the Global South

what percentage of the world is religious –

Mapped: The World's Major Religions, by Distribution

This is the best (and simplest) world map of religions - Big Think