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Although most migrants learn the language of the new location, they typically retain their religion.
Reliable statistics on the number of adherents are difficult to obtain. 2.2 billion people view themselves as Christian, 1.6 billion as Muslim, 1 billion as Hindu, and 500 million as Buddhist, Judaism 14-18 million. In all but a handful of countries, the religion with the largest number of adherents is either Christianity or Islam. Christianity is the most widely practiced religion in every country of the Western Hemisphere and in most countries of Europe and sub-Saharan Africa. Islam is the most widely practiced religion in nearly every country of Southwest Asia and North Africa, as well as in Central Asia. In several countries, including China, the largest number of people are unaffiliated with any religion. Judaism is the most widely practiced religion in the state of Israel. More than 90  percent of Latin Americans and more than 75% of Europeans and North Americans identify themselves as adhering to Christianity. Muslims comprise more than 90% of the population of central Asia and of southwest Asia and North Africa. India is 80% Hindu, where as Bangladesh and Pakistan are more than 90% Muslim. Christianity has three major branches: Roman Catholic, Protestant, and Orthodox. Roman Catholics comprise approximately 50% of the world's Christians. Islam is the predominant religion of Central Asia and of Southwest Asia and North Africa. Buddhism is clustered primarily in East Asia and Southwest Asia. Like Christianity, Islam and Buddhism are divided into major branches with distinctive geographic distributions. Islam in Arabic means "submission to the will of God" and it has a similar root to the Arabic word for "peace." Islam is known as a Muslim which means "one who surrenders to God." The countries with the most Muslims are Indonesia, Pakistan, India, and Bangladesh