Is there a Quranic reason to prove that Shiite (Shia) is the true sect of Islam or Sunni?
Of-course! there are several verses in Quran which can be used to prove Shia are right or Sunnah (Sunni).
The main difference between Shia and Sunni is the subject of Imamat; Shia says Imam is chosen by Allah and He must say to his prophet who is the Imam after him. They say that the prophet Muhammad assigned Ali (as) as his Imam. On the other hand Sunni brothers say that Imam must be chosen by a council and Abubakr is the Imam after the prophet. Here I prove that Imam must be chosen by Allah not a council.
Imamat in QuranQuran says :
Indeed, I will make you an Imam for the people." [Abraham] said, "And of my descendants?" [Allah] said, "My covenant does not include the wrongdoers (Quran 2:124)
In another place, in Shora chapter, Quran says:
And their affair is [determined by] consultation among themselves (Quran 42:38)
Sunni Muslims use this last verse and claim that Imamat is an affair of Muslims and they must select an Imam by consultation. However the first verse says that Imamat is not an affair of people, its an affair and covenant of Allah and He must assign the Imam.
So, Imamat (leadership) is covenant of Allah not affair of people, and Imam must be chosen by Allah, not by consultation .
More images about Shia Islam: Shia Truth