About 3% of the world’s population has migrated across international borders. While that may seem like a small percentage, it represents a lot of people. If the world’s 214 million international migrants were counted as one nation, they would constitute the fifth most populous country on the globe, just behind Indonesia and ahead of Brazil.
Christians comprise nearly half – an estimated 106 million, or 49% – of the world’s 214 million international migrants.
[This is heavily influenced by the world's largest migration flow--that from Mexico to the United States.]
Muslims make up the second-largest share of people who have migrated across borders – almost 60 million, or 27%, Hindus (nearly 11 million) account for 5%) and Buddhists (about 7 million) account for 3%.
There are more than 3.6 million Jewish migrants living around the world (nearly 2%). Adherents of all other faiths – including Sikhs, Jains, Taoists, Chinese folk religions, African traditional religions and many smaller groups – collectively account for an estimated 9 million migrants (4%).
What drives people to a particular location? The Economist summarizes the report's finding by noting that:
Migrants favour countries that are both economically vibrant and culturally familiar—fewer tempting destinations may be one reason why Muslims are less inclined than Christians to up sticks.
The Pew Research Center website has several interesting resources to accompany this report, including an interactive map and data tables that allow you to draw your own conclusions.