The study, based on extensive data for the year 2010, also showed Islam and Hinduism are the faiths mostly likely to expand in the future while Jews have the weakest growth prospects.
It showed Christianity is the most evenly spread religion, present in all regions of the world, while Hinduism is the least global with 94 percent of its population in one country, India.
Overall, 84 percent of the world's inhabitants, which it estimated at 6.9 billion, identify with a religion, according to the study entitled "The Global Religious Landscape" issued by the Pew Forum on Religion and Public Life on Tuesday.
The "unaffiliated" category covers all those who profess no religion, from atheists and agnostics to people with spiritual beliefs but no link to any established faith.
"Many of the religiously unaffiliated do hold religious or spiritual beliefs," the study stressed.
"Belief in God or a higher power is shared by 7 percent of unaffiliated Chinese adults, 30 percent of unaffiliated French adults and 68 percent of unaffiliated U.S. adults," it said.
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Mary Snow, Vice President of the Charlotte Atheists and Agnostics said, "The DNC's presence in Charlotte has provided CAA with a great opportunity to remind our local and national elected officials of their duty to serve all citizens regardless of their religious beliefs or lack thereof."
David Silverman, President of American Atheists said, "I'm proud to stand with the CAA as we lift our voices in opposition to the position religion has in our governmental system. Our nation was founded upon a system that guarantees equal rights to all people. By allowing religion to have a prominent place in the leadership of our country, we violate these freedoms."
For more information about the protest, please contact the Charlotte Atheists and Agnostics at: http://charlotteatheists.com