Developer's DescriptionBy History1111The history of Christianity concerns the Christian religion, Christendom, and the Church with its various denominations, from the 1st century to...The history of Christianity concerns the Christian religion, Christendom, and the Church with its various denominations, from the 1st century to the present.Roman Catholic and Eastern Orthodox Christianity spread to all of Europe in the Middle Ages. Christianity expanded throughout the world and became the world's largest religion due to European colonialism.[1] Today there are more than two billion Christians worldwide.[2]