Christianity -- Islam -- 14 Relations -- 12 Christianity and other religions -- 11 Islam 11 Christianity 9 Controversial literature 8 more ... Missions -- 6 Church history 4 History 4 History -- 4 Judaism -- 3 Dissertations, Academic 2 Relations 2 Religion -- 2 Religious aspects -- 2 Apologetic works 1 Attitudes -- 1 Bibliography 1 Christian sects -- 1 Christianity and other religions 1 Christians -- 1 Church and state -- 1 Church attendance -- 1 Civilization 1 Communication -- 1 Conversion 1 Converts -- 1 Crusades -- 1 Economic policy -- 1 less ...