What follows is the Fatwa (religious verdict/ruling) of one of the Sunni world's most revered scholars, Shaikh Mahmood Shaltoot with regard to the Shia. Shaikh Shaltoot was the head of the renowned al-Azhar Theological school in Egypt, one of the main centers of Sunni scholarship in the world. It should be of interest to know that a few decades ago, a group of Sunni and Shia scholars formed a center at al-Azhar by the name of "Dar al-Taqreeb al-Madhahib al-Islamiyyah" which translates into "Center for bringing together the various Islamic schools of thought". The aim of the effort, as the name of the center indicates, was to bridge the gap between the various schools of thought, and bring about a mutual respect, understanding and appreciation of each school's contributions to the development of Islamic Jurisprudence, among the scholars of the different schools, so that they may in turn guide their followers toward the ultimate goal of unity, and of clinging to one rope, as the well-known Quranic verse, "Hold fast to the Rope of Allah and do not diverge" clearly demands of Muslims.
This massive effort finally bore its major fruit when Shaikh Shaltoot made the declaration whose translation is appended below. It should be made unequivocally clear as well, that al-Azhar's official position, vis a vis the propriety of following any of the Madhaahib, including the Shi'ite Imami school, has remained unchanged since Shaikh Shaltoot's declaration.
Head Office of al-Azhar University:
IN THE NAME OF ALLAH, THE BENEFICENT, THE MERCIFUL
Text of the Verdict (Fatwa) Issued by His Excellency Shaikh al-Akbar Mahmood Shaltoot, Head of the al-Azhar University,on Permissibility of Following "al-Shia al-Imamiyyah" School of Thought
His Excellency was asked:
Some believe that, for a Muslim to have religiously correct worship and dealing, it is necessary to follow one of the four known schools of thought, whereas, "al-Shia al-Imamiyyah" school of thought is not one of them nor "al-Shia al-Zaidiyyah." Do your Excellency agree with this opinion, and prohibit following "al-Shia al-Imamiyyah al-Ithna Ashariyyah" school of thought, for example?
His Excellency replied:
1) Islam does not require a Muslim to follow a particular Madh'hab (school of thought). Rather, we say: every Muslim has the right to follow one of the schools of thought which has been correctly narrated and its verdicts have been compiled in its books. And, everyone who is following such Madhahib [schools of thought] can transfer to another school, and there shall be no crime on him for doing so.
2) The Ja'fari school of thought, which is also known as "al-Shia al-Imamiyyah al-Ithna Ashariyyah" (i.e., The Twelver Imami Shi'ites) is a school of thought that is religiously correct to follow in worship as are other Sunni schools of thought. Muslims must know this, and ought to refrain from unjust prejudice to any particular school of thought, since the religion of Allah and His Divine Law (Shari'ah) was never restricted to a particular school of thought. Their jurists(Mujtahidoon) are accepted by Almighty Allah, and it is permissible to the "non-Mujtahid" to follow them and to accord with their teaching whether in worship (Ibadaat) or transactions (Mu'amilaat).
Signed,
Mahmood Shaltoot.
source : www.rafed.net