What is Catholic? The Catholic Church, also known as the Roman Catholic Church. This is the largest Christian church, with approximately 1.3 billion baptised Catholics worldwide, as of 2016. As one of the oldest religious institutions in the world, it has played a prominent role in the history and development of
Western civilisation. The church is headed by the Bishop of Rome, known as the Pope. Its central administration, the Holy See, is in the Vatican City, an enclave within Rome, Italy. Catholic theology is based on the Nicene Creed.
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