Yeah, but the question is how did it grow so much so that it could reach that status.
Rome was, argumentatively, one of the top cultures of the ancient world. Christianity was born within the Roman Empire. It was initially persecuted, but would go on to become the official religion of Rome in the 4th century AD.
This merger created a unique partnership between the Christian faith and the World Class Secular Empire of Rome; preach to all the nations. Christianity would eventually take over the partnership; Theocracy, but was smart enough to cherish and retain the Roman secular half to form the Catholic Church and the Holy Roman Empire. Christianity became part of an ancient world class leadership tradition. This history of Christianity is very unique.
Had Christianity, after having established the Theocracy, decided to purify the faith and throw out the baby with the bath water; get rid of anything Rome, they would have lost advantages and that winning Roman attitude; faith without technology and prosperity lacks advantages. It took this unique blend of Roman Christianity to institute the Declaration of Independence and form a country of free people. Rome was known for not needing supply lines but could transform the land to their needs. The current trend toward socialism is due to the decline of Roman Christianity in culture, and its role as a leader. Socialism is a downgraded secular replacement, based on mercenaries instead of partners.
The Holy Roman Empire would last 1000 years, from 400's until about the 1400's, when it began to divide; Protestant, Science, Explorers and Atheist Movements. After that it was like the amalgam of Rome and Christianity was breaking down into various ratios of the two attributes. Nazi Germany was like 95% Roma, while the Catholic Church would lose its aggressive Roma ways, to become more ceremonial but still classic and prosperous. Atheism, which also spawned from the original empire, is more like secular Roma, but with the modern Pagan casino gods of dice and cards. Roma persecution of the weaker Christianity, has been reinstated by the Left. Now with the Christian soldiers once again learning to battle in the arena of ideas; old house divided.