Apologetics History 21 Early works to 1800 10 Christianity 8 Philosophy 7 Religion 5 Controversial literature 4 Catholic authors 3 Essence, genius, nature 3 Kingdom of God 3 Apologetic works 2 God 2 Grace (Theology) 2 Popular works 2 Proof 2 Religion and science 2 Theology 2 Analogy (Religion) 1 Belief and doubt 1 Certainty 1 Christianity and other religions 1 Conversion 1 Criticism, interpretation, etc 1 Cults 1 Enthusiasm 1 Eschatology 1 Faith 1 Language and languages 1 Literature 1 Methodology 1