Protestant churches Relations Catholic Church 62 History 20 Christianity 9 Reformation 9 Church history 8 more ... Christian union 7 Interfaith relations 7 Religion 7 Christianity and other religions 6 Judaism 6 Religious aspects 6 Authority 4 Histoire 4 Protestant authors 4 Catholic authors 3 Controversial literature 3 Creeds 3 Doctrines 3 Ecumenical movement 3 Evangelicalism 3 Églises protestantes 3 History of doctrines 3 Protestants 3 Siena Donor: From the collection of The Reverend Thomas Phelan, donated by The McCarthy Charities, Inc 3 Christian ethics 2 Christianisme 2 East and West 2 Ethnic relations 2 less ...