Ruling on the Imamite Shi`ah sect in Islam and its origin

Q 3: Is Imamite Shi`ah an Islamic sect? Who is the founder? In fact, the Shi`ah claim their sect is traceable back to `Aly (may Allah honor (Part No. 2; Page No. 378) his face). However, if the sect of the Shiites is not Islamic, in what way will it be non-Islamic? I hope Your Eminence graciously gives me a detailed account provided with valid evidence of the Shiite sect and their beliefs along with highlighting some innovative Islamic sects.

A: The fundamentals and secondary elements of the Imamite Shi`ah are Bid`ahs (innovations in religion). You are advised to consult the books "Al-Khututul-'Aridah", "Al-Tuhfa Al-Ithna 'Ashariyyah Abridged" and "Minhajul-Sunnah" by Shaykh-ul-Islam for an account of many of their Bid'ahs.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.