Muslim - Shia Unity?

Asslamo Allaikum Wa Rahmatullahi Wa Barakatuh,

There is a clear line of demarcation in Islamic history between Rafidhees (Shias) of before 300 AH and after 300 AH.

1. Shias of before 300 AH disagreed with the Khilafah of Sayyidina Usman (RA) and that's about it. They didn't revile the Sahaba (RA), tehy followed Sunnah, they didn't have their own Fiqh etc. That's why you see Shia narrators  in Saheeh Bukhari
2. Rafidhees (Shias) after 300 AH added a whole bunch of things which included the concept of Imamat, reviling the Sahaba, changing of the Qur'aan:
   1. In Pakistan, India & Iran today we have Shia Ithna Ashariyya (twlevers) who are straight up Kaafir
   2. In Syria today we have Alawees who are straight up Kaafir

Those calling for Muslim-Shia unity in India/Pakistan need to clearly EXCLUDE Ithna Ashariyya (twlevers) otherwise it is a very SERIOUS problem!

So you need to define very clearly what you are asking. If you are asking for co-operating with Zaidi Shias of Yemen who are pretty close to Sunnees or some other sects then there is scope but they don't exist in India/Pakistan.

Scholars of India such as Mujaddid Alf Thani (RA) as far back as 1000 AH have clearly written about "Indian" Ithna Ashariyya (twlevers) and clearly called them KAAFIR.

If there are Ulamah who are mingling with them and calling for unity with Ithna Ashariyya (twlevers) then they need to be called out in my opinion. Read this

Maulana Tariq Jameel (HA) retraction of his views about Shia

Jazakullah Khairun
 

I am not a Scholar but in my opinion there is no unity with Ithna-Asharees because of their leaving Islam jst like Qadiyanees.