This is because they follow the old tradition. This tradition was written in the middle ages reflecting the fanatic holy war between Muslims and the Christians in that time. They used to twist the meanings of the holy Quran and fabricate sayings and attribute them to the Prophet Mohammed, two centuries and more after his death. The Wahabism has restored this Middle-aged culture and spread it as the real Islam. By the Saudi influence, the Quranists are persecuted because they are calling to understand the Holy Quran according to its terminology and terms. The Quranic movement suffers arrest and persecution in Egypt because it works for reform Muslims from within Islam.