Many Christian denomination see themselves as part of the worldwide Church which includes other denominations as well . The Roman Catholic Church is the largest denomination with over 1.1 billion members , comprising over half of all Christians worldwide making it the largest denomination for any religion worldwide ( although the Church itself does not view itself as a denomination , but as pre-denominational ) . Protestant denominations comprise roughly 38-39 % of Christians worldwide , and together the Catholics , Protestants , Anglicans , and other closely related denominations comprise Western Christianity .