In the view of the writer the belief in a redeemer is merely a Shia belief which was rendered advantageous to Bani Abbas as well. As the Sunni school of thought emerged, they held on to this belief which at times was to their interest. This belief of a redeemer was that of all Muslims. Who actually was and is this Redeemer? This stood the dispute that divided the opinion among Muslims. Bani Abbas tried to show that the Redeemer was one from them. They could only try when there existed a general belief. It is a good proof that the Muslims commonly were holding this belief without any reservations. Mansoor tried to introduce his son Mohammad Bin Abdullah as the Redeemer. For this purpose he gave him the title of MEHDI. The efforts in this field regardless from where it came from did not succeed, because the people did not approve of their reputation for such a post.
Adapted from: “A Reply To Belief Of Mahdism In Shia Imamate” by: “Ayatollah Lutfollah Saafi Golpayegani”