Their claims about Mahdi (pbuh) not being mentioned in the Qur'an are not true. Surat al-Kahf and Surah Yusuh entirely refer to the system of the Mahdi. The story of the Prophet Solomon (pbuh) refers to the system of the Mahdi. The 55th verse of Surat An-Nur refers to the global dominion and the system of the Mahdi. - Harun Yahya