Quranism is the belief that the Quran is the only source for Islam. Followers of the group are called Quranist Muslims, or Quran alone Muslims or Quraniyoon. Quranists reject the Hadiths as they believe that the Hadith literature which exists today is apocryphal, as it had been written three centuries after the death of the Islamic prophet Muhammad; thus, it cannot have the same status as the Quran. Quranists believe that obedience to Muhammad means obedience to the Qur'an, and not the hadith. Several extra-Qur'anic traditions upheld by Sunnis are regarded as idolatry (shirk) by Quranists.