In the first 200 years, Christianity was banned by the government (Roman Empire) as a heresy, and Christians were persecuted and even executed. It was not until 3 13 that the Roman emperor Constantine the great issued the imperial edict of Milan, which made Christianity a religion permitted by the government. In 325, the Nicaraguan creed was adopted at the first Nicaraguan public meeting and became the most basic principle of Christianity. Now almost all Christian sects accept this principle. In 39 1 year, the Roman emperor Theodosius I declared Christianity as the state religion. Since then, Christianity has developed rapidly.

In 476, the Roman Empire was divided into East Rome and West Rome under internal contradictions and foreign invasion, and Christianity also began to split into Orthodox Church (calling itself Orthodox Church) and Roman Catholic Church (calling itself Catholic Church). Both sects claim to be Christian orthodox. The Pope is the supreme leader of Catholicism, while the Archbishop of Constantinople is the leader of Orthodox Church. By 1054, the Eastern Church and the Western Church announced to each other that they would expel each other's bishops, which marked the official separation of Catholicism and Orthodox Church, and was called the Great Christian Split.

With the rise of Islam in the 7th century, Jerusalem fell under the control of Muslims. During the period of 1095- 129 1, the churches and countries in western Rome carried out eight crusades to liberate the holy land of Jerusalem.

/kloc-In the 6th century, religious reforms took place in Germany, Switzerland, the Netherlands, Northern Europe and Britain, resulting in Protestant churches separated from the Catholic Church. The leaders were Martin Luther, Calvin and others, who established Protestantism and Anglican Church and broke away from Roman Catholicism. China's so-called "Christianity" was basically the time when Protestantism came into being.