one who believe that Prophet Muhammad (S.A.W) is that the last messenger of Allah, merely he's not a non-Muslim.
Mainly there are 3 basic things that Sunni says that's wrong in Shias.
1. they have different KALMA
2. They object on Suhaba (R.A)(companions of Prophet Muhammad (S.A.W))
3. They perform Prayer in different approach i.e. 3 times every day.
---“La ilaha illa-llah, Muhammadu-rasulu-llah” This kalma isn't mentioned in al-Qur'an in such form. La ilaha illa-llah and Muhammadu-rasulu-llah both are two different kalma that were joint along and created one kalma. The Kalma that Hazrat Muhammad (S.A.W) teaches to Muslims was Ašhadu an la ilaha illa-llah wahdahu lar sharika la, wa ašhadu anna Muhammadun Aabduhu wa rasuluh, and this kalma is for all Muslims.
There is no such dangerous things to feature another kalma with the kalma tayaaba incase that's RIGHT ONE, after all Muslims shaped this kalma by combining 2 kalmas, If Shias added Ali wali ullah then what’s wrong in it little question he was ALLAH’s WALI.
----Sunnis says that one can’t say one thing wrong regarding SUHABA KARAM, what Yazid did it absolutely was a blunder (aggregative mistakes), no doubt a giant mistake he did a war against Imam HUSSAIN the grandchild of messenger of Allah and kill him. however Shia are against him, they believe that he has done such factor that ought to not be done by any means
--- Shias offer pray otherwise than Sunnis. Shias perform three prayers and that they perform Zohar and Assar prayers at one time. whereas it’s a Sunnah, the distinction is that Shias created this a habit and Sunnis says no we'd not try this.
Narrations of Ibn 'Abbas (R.A)
"The Prophet (salallahu alayhi wa sallam) performed Zohar and 'Assar along and maghreb and 'Isha along while not (being within the state of) worry or travel."
"The Prophet (salallahu alayhi American state sallam) combined Zohar and 'Assar along and maghreb and 'Isha along in Medina while not (being within the state of) concern or rain." (Sahih Muslim 1:246)
Prophet Muhammad himself prayed a pair of prayers at just one occasion whereas he wasn't traveling nor there were any unfavorable conditions. folks asked Ibne Abbas (R.A) and ABU HURERA (R.A) why Prophet do thus once there's no such dangerous things happening, he replied so Muslim be feel free and that they perceive that it not a problem to perform two prayers at the same time.
Abdullah ibne Zubair, Hassan Basri, Muhammad Ibne siren, imam Abu Hanifa’s teacher Ibrahim al-Nakha‘i, used to offer pray without fastening hands.
Explanations by MULANA MUHAMMAD ISHAQ (May his soul rest in peace)