Slavery 171 Controversial literature 133 Catholic authors 64 Christianity 59 History 47 Religious aspects 47 Protestant authors 30 more ... Religion 30 Theology, Doctrinal 29 Politics and government 27 Civil war 24 Judaism 20 Apologetics 19 Doctrines 17 Islam 17 Justification 16 African Americans 14 Zionism 14 Reformed Church 13 Society of Friends 12 Church history 11 Criticism, interpretation, etc 11 Lutheran Church 9 Philosophy 9 Theology 9 Atheism 8 Relations 8 Slavery and the church 8 Apologetic works 7 Christianity and other religions 7 less ...