Apologetics History 570 Christianity 94 Philosophy 66 Doctrines 65 Kingdom of God 55 Theology 45 more ... Theology, Doctrinal 41 Apologetic works 37 Religion 36 Religion and science 31 God 30 Religious aspects 27 Christian ethics 26 Faith 25 Controversial literature 23 Judaism 22 Atheism 20 Catholic authors 20 Church history 20 Christianity and other religions 19 Evidences, authority, etc 19 Natural theology 17 Free thought 16 Early works to 1800 15 Philosophy and religion 15 Criticism, interpretation, etc 14 History and criticism 13 Revelation 13 Theism 13 less ...