Which religion is right - Shia or Sunni?
There are a lot of books to answer this question, among them are Alghadir, Almurajiat and Nights of Peshawar. However there are several simple proofs for Shia which every Muslim without prejudice will accept them.
Five simple questions from Sunni brothers
There is a common narration from Sunni and Shia sources that says: everyone who dies and he does not know the Imam of his time, dies the death of ignorance.
Question #1: Did Fatima (SA), know Imam of his time or not? If she did not, she is died in ignorance, NauzoBillah, and if she did, her Imam was Ali (as) not Abubakr. So Fatima was Shia.
Sunni brothers say that the leader must be chosen by a council and shia say that the prophet appointed and mentioned all 12 Imams.
Question #2: Which council appointed the second caliph? Second caliph was appointed by Abubakr not a council! while Aboobakr was appointed by council of 13 people
There is a reliable Hadith from Shia and Sunni sources that says: Caliphs after the prophet (pbuh) are 12 (Twelve successors Hadith).
Question #3: What are your 12 Imams? Count them and you can not find twelve Imams in Sunni Muslims while shia have exactly twelve Imams
Sunni Muslims, take their religion from four Imams: Imam Malik, Imam Shafi’i, Abu-Hanifeh and Ahmad-ibn-Hanbal.
Question #4: These four imams you have, lived in what century? And what is their relation with the Caliphs? The Shia Imams are their Caliphs as well. But you have four caliphs and four imams who lived almost 100 years after Khulafa.
Shia Muslims have thousands of prayers and Monajats from their twelve Imams available in several books like Mafatih Aljanan, Sahife Sajjadiey, Almoraqibat, etc.
Question #5: How many prayers, hymns or praise of the Lord you have quoted from your first three Caliphs or your 4 Imams? Count them and you will find nothing countable.
Now decide, Shia are wrong or Sunni? Unfortunately some extremist Muslims like ISIS say that shia are Kafir! and killing them has the reward of paradise! while grand Sunni scholars like Sheikh Shaltoot have confirmed Shiite as a true Islamic religion.