Christianity is one of the world's leading religions, and at the beginning of the third millennium it has the most adherents. The total number of Christians is approaching two billion. Christians live on all continents. In Europe, America and Australia, Christians make up the majority of the population. Christianity plays a vital role in the social, economic and cultural life of peoples and states. The chronology, which is used in many countries of the world (including Russia), begins with the date of the birth of Christ. For middle and high school age.