The study, from the nonpartisan wealth research firm New World Wealth, found that of the 13.1 million millionaires in the world, 7.4 million, or 56.2 percent, identify themselves as Christian when asked about their religion. Fully 6.5 percent of millionaires identified themselves as Muslim, 3.9 percent identified themselves as Hindu and 1.7 percent identified themselves as Jewish. Fully 31.7 percent of millionaires identified themselves as "other," which includes other religions and "no religion."