Of the world’s population of 7.8 billion, Christianity is the most widely practised religion in the world, with more than 2 billion followers. Next in popularity are 1.5 billion followers of Islam and 900 million Hindu. There are many beliefs that Christians have in common. There are however, not unsurprisingly, also many differences in the more than 21,000 Christian denominations.
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Catholicism is by far the largest branch of Christianity with an estimated 1.285 billion followers.
The Liturgy of the Eucharist is the core of the Mass and the heart of Catholic belief. The priest and the participants speak a series of formal prayers, including a communal recitation of the Lord's Prayer, and the entire community watches the transformation of the bread and wine into the body and blood of Christ, which believers then receive into their own bodies. This transformation from the simple elements of bread and wine into the physical presence of the divine is called transubstantiation and is a point of mystery and wonder for Catholics.