The Roman Catholic Church is less than 1700 years old. The Council of Nicea was in 00325 CE, and the bishops derived their authority from their local congregations rather than from a pope until roughly the Council of Chalcedon in 00451. If you believe that it's closer to 2000 years old, you must also believe that its original purpose was to prepare for the end of the world and the Day of Judgment within the lifetimes of the first Christians. More plausibly, its original purpose was to remove the threat Christianity posed to the political stability of the Roman Empire. The Roman Empire fell in 01453, almost 600 years ago.
> The Roman Empire fell in 01453, almost 600 years ago.
The Eastern Roman Empire, more commonly known as Byzantium or the Byzantine empire, fell in 1453. They weren't under the authority of the Catholic church ( great schism and all that).