Combat Kit
A book in English in which its author mentions a set of steps for those interested in discussing Christians. They are: (1) To refrain from reading any book or article on comparing religions, (2) To take care of the Prophetic inheritance that he left you so you learn the Quran, memorize it as much as you can, and learn the Islamic doctrine, jurisprudence, Prophetic hadith, Quran interpretation, Arabic language, biographies, and the rest of the necessary knowledge, (3) To deeply study the Islamic creed and learn more about the different doctrines and Muslim sects, (4) To study references in the field of calling Jews and Christians to Islam, and (5) To read the Bible and the Jewish and Christian references.