The Roman Emperor Galerius issued an edict permitting the practice of the Christian religion under his rule in April 311. In 313 Constantine I and Licinius announced toleration of Christianity in the Edict of Milan. Constantine would become the first Christian emperor. By 391, under the reign of Theodosius I, Christianity had become the most popular, or state religion. Constantine I, the first emperor to embrace Christianity, was also the first emperor to openly promote the newly legalized religion. As the political boundaries of the Western Roman Empire diminished and then collapsed, Christianity spread beyond the old borders of the Empire and into lands that never had been Romanized.
The most famous colonization by Protestants in the New World was that of English Puritans in North America. Unlike the Spanish or French, the English colonists made surprisingly little effort to evangelize the native peoples. The Puritans, or Pilgrims, left England so that they could live in an area with Puritanism established as the exclusive civic religion. Though they had left England because of the suppression of their religious practice, most Puritans had thereafter originally settled in the Low Countries but found the licentiousness there, where the state hesitated from enforcing religious practice, as unacceptable, and thus they set out for the New World and the hopes of a Puritan utopia.
Christianity is a religion open to all humanity that counts one out of every three people on earth among its members. The Christian world encompasses a greater area of land than that of any other religious territory. In terms of both population and geography, Christianity is the world's largest religion. As such, Christianity contains a great diversity, and has followers from a wide range of ethnicities, nationalities, and cultures. Both Europeans and non-Hispanic Whites are shrinking minorities in the Church.
Europe
In his book Enlarging the Story: Perspectives on Writing World Christian History, Richard Fox Young views the connection between Christianity and Eurocentrism as tenuous, and points to the postcolonial and non-European nature of the emerging Church and its impact on the development of World Christianity. In the postcolonial world, Christianity has lost its association with the West.
Christians outside Europe and North America
At the turn of the millennium, 60% of the world's two billion Christians lived in Africa, Latin America, or Asia, and by 2025, those demographics will shift to an estimated 67% of the world's three billion Christians. The rise of Christianity in the southern hemisphere, especially northern Africa and Latin America, in the late 20th and early 21st centuries is a "grassroots movement" that has generated new forms of Christian theology and worship, and shifted the cultural and geographic focal point of the Church away from the West. The prominence of the southern hemisphere's Christianity has brought with it a cultural and intellectual diversity to World Christianity, and contributed such ideas as Liberation Theology.