Christianization of the Roman Empire
The emergence of papal primacy aided the consolidation and growth of Christianity in the West. In both theory and practice, Pope St. Leo I established the primacy of the Roman bishop. Byzantine Christianity had grown increasingly estranged from the West, and it had pursued its path in crafting its legacy. Constantinople was the most cultured city in Christendom when Western civilization was attempting to domesticate the German barbarians. The phenomenal growth of Western Christianity during the Middle Ages was both a cause and an outcome of a conflict with the East.
The sack of Constantinople by Western Christians in 1204 and the founding of the Latin patriarchate there followed the breach in 1054, demonstrating increasing separation. The conflict between the church and the empire has recurred throughout medieval Christianity's history.
Scholastic theology attempted to reconcile the doctrinal traditions passed down from the Fathers of the early church with classical antiquity's intellectual achievements. Scholasticism was a watershed moment in the history of Christianity and Western civilization because it united loyalty to Scripture and tradition with a positive, albeit critical, attitude toward the "natural" intellect. It is also a crucial character informing Western philosophy and a symbol of the Christianization of society and culture.
The Reformation did not intend church schisms or the abolition of Christian culture. However, when the Reformation ended, both the church and the culture had undergone significant changes. As a result, Christendom became divided, and the West became secularized. In the contemporary world, Roman Catholicism has evolved to adapt traditional forms to the implications of these results. During the foundational period of modern Western history, Christianity was involved in numerous cultural and political expansion movements.
Christianity has lost much of its reputation and influence on numerous fronts despite its continued dominance throughout the modern age. Surprisingly, the demise of "established Christianity" in the traditional sense resulted in Christianity's most rapid and broad expansion throughout history.
During the 17th and 18th centuries, the status of Christian religion and life within churches mirrored and resisted the spirit of the period. Even though the Protestant Reformation absorbed part of the reform energy inside Roman Catholicism, the Roman Catholic Counter-Reformation significantly revised theology and morality. Pietism called Protestant Christians to greater seriousness in personal faith and practical life, partly as a counterbalance to the overemphasis of orthodoxy on theory at the expense of morals. As science progressed, it collided with long-held beliefs about the theory of creation, many of which were fervently defended by organized Christianity's leaders. In the history of Christian missions, both Roman Catholic and Protestant, the nineteenth century was dubbed "the great century."
Totalitarianism, emerging global religions, and apathy posed new obstacles to the Christian cause in the twentieth century. However, further efforts to repair the schisms within Christendom were made. Christianity has become the world's most frequently practiced religion. Christians make up a modest percentage of the population in many nations. Most Asian and African nations have Christian communities, some of which number millions, like in India and China. The historical dominance of Western Christianity was threatened by massive increases in the size of such congregations. References: https://www.britannica.com/topic/Christianity/Contemporary-Christianity