So the only Sect that will be saved is the Ahl al-Sunnah, which both Shia's and Sunnis (and other sects) claim to be.
Awf bin Maalik narrated:
"The Prophet (saw) said: "the jews divided into 71 sects, 1 is in Jannah and 70 are in hellfire, , the Christians were divided into 72 sects, …, by the one whose hand my soul is in, My Ummah will be divided into 73 sects, 72 are in hellfire." The Sahabah asked "who are the saved sect?" he (saw) said: "Al Jama'ah"." [Sunan ibn Majah 3982, Kitab Al Fitan]
Right, and Sunnis and Shiites are considered to both be in that 1 sect, even though they differ on several issues.
The Shia say Abu Bakr Umar and Uthmaan robbed Ali of his position of being Khalif.
They say Umar was a 'Original Kaafir' and 'Zindiq'-renegrade.
They say one should dissociate with the 4 idols: Abu Bakr, Umar, Uthmaan, Muawiyya and 4 women Ayesha, Hafsa, Harid, Umm-al-Hakam.
One should curse the above after each prayer.
Abu Bakr and Umar are Kaafirs
Abu Bakr and Umar are worse than Shaithaan and they are dwellers of Hell.
Ayesha and Hafsa are both Hypocrites
Ayesha and Hafsa - Poisoned Mohammed before his death.
Now lets see some of the Shia thoughts concerning Sunnis in general.
Most dirty and polluted left over water is that of a sunni.
Not permissable to marry sunni because they are Kaafir.
Cannot eat animal slaughtered by sunni.
Sunnis created from soul of Jahannam.
Shia's created from soul of Jannat.
Yes, one can commit acts of kufr, but that doesn't make someone a kafir nor entirely remove him from the fold of Islam.
Peace