When reading through the Islamic hadiths, it is obvious to me that Muhammad was there to promote his god and the Quran that was sent down, so he obviously would not have time to go around attacking the Bible of the Christians, because he has to treat the Quran as if it is a superior book. But modern dawah Muslims seem to have been tricked into instead promoting the Bible, by talking about it more than the Quran, almost as if they know that it is a superior book, so they have to talk about it more than their inferior book. I think that Yahya was a bit surprised by this question, because he didn't seem to want to talk too much about this subject and in the end he told me that he did not want to talk about this subject again. So Muslims have to decide if they want to be like the current Muslims who are pushing a modern fake dawah, or do they want to stick with what their prophet was doing, by just promoting the Quran as the only book that they care about.