the Catholic Church of the Middle Ages, history homework help

Christianity emerged as one of many religions in the Roman world, but came to be one of, if not the, defining forces of Western Civilization. How did Christianity evolve from its origins to the official faith of the Roman Empire, to the Catholic Church of the Middle Ages, and then to the Church divided by the Protestant Reformation? Please be sure to make a clear argument with a thesis, and use specific evidence and examples throughout