Controversial literature Catholic authors 13 Christianity 10 Early works to 1800 8 Protestant authors 6 Slavery 6 Doctrines 5 Apologetic works 4 Apologetics 4 History 4 Judaism 4 Atheism 3 Catholic Church 3 Religious aspects 3 Theology 3 Communism 2 God 2 Grace (Theology) 2 Jewish interpretations 2 Jews 2 Lutheran Church 2 Reformed Church 2 Religion 2 Abolitionists 1 Ahmadiyya 1 Anabaptists 1 Anarchism 1 Antisemitism 1 Antislavery movements 1 Arminianism 1