sentences:  The Eastern Catholic Churches make up 2% of the membership of the Roman Catholic Church and less than 10% of all Eastern Christians.Most Eastern Catholic churches have counterparts in other Eastern churches, whether Assyrian or Oriental Orthodox, from whom they are separated by a number of theological differences, or the Eastern Orthodox churches, from whom they are separated primarily by differences in understanding of the role of the Bishop of Rome within the College of Bishops.The Eastern Catholic churches were located historically in Eastern Europe, the Asian Middle East, Northern Africa and India, but are now, because of migration, found also in Western Europe, the Americas and Oceania.