This is what ALL their grand Rabbis from day one said, starting from Ayatullat Ibn Saba’ who invented the Wilayah/Imamah belief up to the likes of Mufid and Majlisi and other major Rafidi Shia scholars who all deemed ANY non-Twelver (inlcuding other Shia groups) as disbelievers. So don’t get fooled by some apologetic Shias in the west or by the propaganda of the Iranian regime who all try hard to hide their ugly Takfiri beliefs IN ORDER to FOOL the average Sunni Muslim and Islamic Ummah (that is over 90% non-Shiite).
Here the Fatwa:
Translation (yellow marked part):
As for all the different Shiite groups, except for the Twelvers, then their disbelief has been proven according to many of our text and many of our classical narrations state that whosoever rejects a single Imam is like the one who says Allah is one of three [trinity].And Al-Kishi reported with a chain [of transmission], on the authority of Ibn Abi Omayr [broken chain] who said: ‘I asked Muhammad Ibn Ali Al-Ridha (AS) about the following verse:
[Some] faces, that Day, will be humbled [hard] and exhausted. Working [hard] and exhausted. [Surah Al-Ghashiyah, Verse 2-3]
He [Muhammad Al-Jawad son of Al-Ridha] said: ‘This verse was revealed about the Nawasib [Sunnis], Zaydi [Shiites] and Waqifi [Sevener Shiites] […]’
Looked how they lied upon the Ahl Al-Bayt. Not just Takfir on Nawasib [which stands for enemies of Ahl Al-Bayt who – according to classical Shiite literature – are no one but those who call themselves Ahl Al-Sunnah i.e. the Hanafis, Shafiis, Hanbalis etc.) but even Takfir on OTHER RAFIDI (yes, Waqifis are Rafidis) Shiite sects! Then these very Twelver Shiites (including their scholars) have the audacity to accuse’Wahhabis’ and other Muslims (who simply reject and chose the freedom of exposing Shiism) of being Takfiris! Here their Grand Ayatullat (who by the way resides in QOM/IRAN!) Sadiq Shirazi (who looks like a Jewish Rabbi) is making takfir of all non-Twelvers, and saying refusing one Imam is like believing there are three Gods! Be aware fellow Muslim, don’t be fooled by the sweet talk of some Rafidah apologists (particularly in the west), these Rafidah (just like the Khawarij) are one of the most extreme Takfiri groups, they spared no one, neither Abu bakr and the Sahaba nor other Shiite sects.