Christians in Iraq are the heirs to a very ancient religious tradition that predates the birth of Islam in the 7th century. Almost all of these Christians are descendants of peoples who lived in Mesopotamia before the Christian era. The Chaldean Church was founded in Babylon by Saint Thomas and his disciples. They evangelized pagans and exiled Jews. At that time, it was known as the Church of the East. This Church, which had been separated since the Council of Ephesus in 431, rejoined the Catholic Church in 1553. The Assyrian Church remained separate.
– In 1932, Christians made up 20% of the population;
– Beginning in the 1980s, the country experienced an initial wave of emigration, and the Christian population has since fallen to just 10%. Since the U.S. intervention, the population has continued to decline:
– in 2005, Christians still made up 5% of the population,
– in 2007, only 3% remained,
– in 2008, the figure had reportedly fallen to just 2%.