Report: Nearly 1 in 4 People Worldwide Is Muslim

We need to be more respectful of these people, or they will hate us:

The global Muslim population stands at 1.57 billion, meaning that nearly 1 in 4 people in the world practice Islam, according to a report Wednesday billed as the most comprehensive of its kind.

The Pew Forum on Religion and Public Life report provides a precise number for a population whose size has long has been subject to guesswork, with estimates ranging anywhere from 1 billion to 1.8 billion

The report also sought to pinpoint the world's Sunni-Shiite breakdown, but difficulties arose because so few countries track sectarian affiliation, said Brian Grim, the project's senior researcher.

As a result, the Shiite numbers are not as precise; the report estimates that Shiites represent between 10 and 13 percent of the Muslim population, in line with or slightly lower than other studies. As much as 80 percent of the world's Shiite population lives in four countries: Iran, Pakistan, India and Iraq.

The report provides further evidence that while the heart of Islam might beat in the Middle East, its greatest numbers lie in Asia: More than 60 percent of the world's Muslims live in Asia.

About 20 percent live in the Middle East and North Africa, 15 percent live in Sub-Saharan Africa, 2.4 percent are in Europe and 0.3 percent are in the Americas. While the Middle East and North Africa have fewer Muslims overall than Asia, the region easily claims the most Muslim-majority countries.