Nearly 1 in 4 people worldwide is Muslim, report says

And Russia has more Muslims than Jordan and Libya put together.

Nearly two out of three of the world's Muslims are in Asia, stretching from Turkey to Indonesia.

The Middle East and north Africa, which together are home to about one in five of the world's Muslims, trail a very distant second.

There are about 1.57 billion Muslims in the world, according to the report, "Mapping the Global Muslim Population," by the Pew Forum on Religion & Public Life. That represents about 23 percent of the total global population of 6.8 billion.

There are about 2.25 billion Christians, based on projections from the 2005 World Religions Database.

Brian Grim, the senior researcher on the Pew Forum project, was slightly surprised at the number of Muslims in the world, he told CNN.

"Overall, the number is higher than I expected," he said, noting that earlier estimates of the global Muslim population have ranged from 1 billion to 1.8 billion.

The report can -- and should -- have implications for United States policy, said Reza Aslan, the best-selling Iranian-American author of "No God but God."

"Increasingly, the people of the Middle East are making up a smaller and smaller percentage of the worldwide Muslim community," he told CNN by phone.

"When it comes to issues of outreach to the Muslim world, these numbers will indicate that outreach cannot be focused so narrowly on the Middle East," he said.

"If the goal is to create better understanding between the United States and the Muslim world, our focus should be on south and southeast Asia, not the Middle East," he said.

He spoke to CNN before the report was published and without having seen its contents, but was familiar with the general trends the report identified.

The team at the Pew Forum spent nearly three years analyzing "the best available data" from 232 countries and territories, Grim said.

Their aim was to get the most comprehensive snapshot ever assembled of the world's Muslim population at a given moment in time.