The Catholic Church, which is a communion of 23 Churches sui iuris (self-governing), all in communion with the bishop of Rome, the pope, has approximately 1.1 billion members, making it the largest...
The Eastern Orthodox Church, which is a communion of 25 autocephalous and autonomous churches in communion with the bishop of Constantinople, the Ecumenical Patriarch, claims about 225 million...
The National Council of Churches produces an annual yearbook on American and Canadian Churches.The yearbook shows that the largest single christian denomination in the United States is Catholic with...