How can a Shi’i become one of Ahl al-Sunnah wa’l-Jamaa’ah?
Question

                How can a Shi’i become one of Ahl al-Sunnah wa’l-Jamaa’ah? The kaafir can utter the Shahaadatayn but what should the Shi’i do?.
Praise be to Allah.If a person was following 
    an ‘aqeedah that is contrary to that of Ahl al-Sunnah wa’l-Jamaa’ah, such as 
    the belief that the Qur’aan has been altered, or that the imams are 
    infallible and can bring benefit or cause harm, and their help is to be 
    sought at times of hardship, or the belief that all the Sahaabah except a 
    few apostatized, or the belief that some people will be resurrected before 
    the Day of Judgement and that Allaah may change His mind (when new facts 
    emerge) and that Ahl al-Sunnah are kaafirs, then the way for him to repent 
    and become righteous is to give up these beliefs, and adopt the beliefs of 
    Ahl al-Sunnah which is belief in the Oneness of Allaah (Tawheed) and not 
    associating anything with Him; venerating the Sahaabah, loving them and 
    approving of them; believing that the Qur’aan is sound and free of 
    distortions, additions or subtractions, basing his belief on evidence from 
    the Qur’aan and Sunnah as understood by the early generation (salaf) of this 
    ummah. 
For more information on 
    beliefs that are contrary to that, please see the answer to question no.
    60046,
    44970,
    101272 and
    95588. 
And Allaah knows best.