Catholic Church Protestant churches Relations 62 History 15 Church history 10 Reformation 8 Religious aspects 7 more ... Christian union 6 Christianity 5 Authority 4 History of doctrines 4 Interfaith relations 4 Protestant authors 4 Catholic authors 3 Controversial literature 3 Creeds 3 Doctrines 3 Ecumenical movement 3 Siena Donor: From the collection of The Reverend Thomas Phelan, donated by The McCarthy Charities, Inc 3 Christian ethics 2 Christianity and politics 2 Evangelicalism 2 Église catholique 2 Law and gospel 2 Liberalism (Religion) 2 Protestants 2 Religion 2 Sacraments 2 Theology 2 11.55 Protestantism 1 less ...