What did sunnis and shiites disagree about?

Answer 1

shia and sunni are not fighting. but Wahhabi groups like Al-Qaede and Taliban,... are fighting both shia and non-Wahhabi sunni and also non Muslims.

please refer to below related question:

Answer 2

shia and sunni have mostly same beliefs and both believe in fundamental beliefs of Islam. today there is up to 260 sect in Islam that are in two category of shia and sunni.

shia believes in Allah, prophet and all fundamentals of Islam.

shia believe after death of prophet God selects the successive for prophet who is the leader of Muslim community and people can not select it.

shia believe the Caliph (Representative of God in earth after prophet) is appointed only by God and can not be selected by people because God said in Koran: "Indeed, I will make upon the earth a successive authority." (Quran 2:30)

this means only God can select an Islamic leader.

in shia they are only fourteen infallible (12 Imams and prophet and his daughter Fatimah Zahra (sa))

and all of them are the same and have no mistake and have the knowledge of everything (this knowledge is from God and by permission of God and is not absolute knowledge. absolute knowledge is only for God and they still do not know many things. but they know anything human may need to know.) and they never die and they hear all sayings and even thinks of all humans after their death by permission of God and they are intermediates between God and human.

and shia Muslims always support them and forgive their lives for them.

shia Muslims do not consider selection of Abubakr as Caliph valid because God did not select him. they believe God ordered prophet to declare Ali is selected as successor of prophet (Quran 5:3) and prophet did this mission in Ghadir event that was in last Hajj of prophet in his life and prophet did a speech for 120,000 Muslims participating that Hajj with prophet. the famous shia book Al-Ghadir is a collection of evidences and proofs for Ghadir Hadith from 100,000 sunni references and read all of 10,000 sunny books. one sunni scholar said if we want to reply Al-Ghadir book (by Allameh Amini) we should first destroy all our books.

Shia doctorin has root in Karbala. when tragedy of Karbala happened most of iranians became shia.

Answer 3

There is no general conflict between all or almost all Sunnis and Shiites in the way that there were conflicts in Europe between almost all Catholics and Protestants in the 16th and 17th century (Thirty Years War et al.). While there are certainly conflicts between Sunnis and Shiites, it is always in a localized or national context, not an international one. In much of the Muslim world, "Sunni" and "Shiite" are viewed as more than just religious labels, but have a "quasi-ethnic" component. It has the power to determine social groups and political organizations, prompting conflict on those grounds.

However, there are numerous theological differences which spark controversy between Sunnis and Shiites which directly lead to conflict, including:

1) Theology: The Muslim community was united while Mohammed was the leader of this community. Most Muslims hold, however, that he never specifically chose a successor to his leadership. There was a minority in the community that supported the candidacy of 'Ali, the Prophet's son-in-law, this political faction became known as the "Supporters of 'Ali" which in Arabic is Shiat 'Ali (where the modern term "Shiite" comes from). They derived their support from specific hadiths and events that they claimed showed that God had revealed to Mohammed that 'Ali would succeed him. The majority of Muslims held that these hadiths and events showed nothing more than that 'Ali was very pious, something they did not deny. Therefore they gave power to the man who was Mohammed's second-in-command and father-in-law Abu Bakr. This majority were called the People of the Customs [of the Prophet] which in Arabic is Ahl Sunna (from where the modern term "Sunni" comes from.)

2) Historical Grievances: The primary reason this division persists is that there has never been an atonement by either side for the pain and persecution that it has suffered when the other was in power over a given territory. Although, Shiites endured more persecution at the hands of Sunnis than the reverse, this is not to say that Sunnis have not endured persecution at Shiite hands. Both groups remain defiant that since they have the moral high-ground as granted from their faith, their actions in repressing the other sect, torturing its adherents, and murdering its leaders was progress towards removing the heresy. Compare this to the Catholics, who have apologized for the Rape of Byzantium, which was huge historical grievance between them and the Orthodox.

3) Ethnic Identities: In many countries, especially Iraq, Syria, and Lebanon, people identify "ethnically" by their sect of religion. Therefore saying somebody is Shiite in Iraq is similar to how people view being Irish-American or Japanese-American in the United States. It marks you socially and it determines who your friends are, who you marry, what jobs you take, who you love, who you despise, etc. As a result, whenever conflict has broken out, each religious group comes together to defend its people's interests. This results in political and social hatred of the other religion in addition to any theological issues.

4) Rumors of the Other's Theology: Some Sunnis think that Shiites are deluded into believing that 'Ali was a second prophet, which would violate Mohammed being the final capstone of the Prophets, a huge theological issue. Some Shiites believe that Sunnis were paid off to accept the three Rightly-Guided Caliphs before 'Ali and that Sunni Islam was therefore corrupt and ineligible to continue the Islamic tradition. Both have alleged the other was deceived by Jews, which says more about how Muslims view Jews than each other. Of course, both of these are mis-characterizations of the actual theologies of these two sects, but the point remains that as long as these problematic rumors exist, the two sides cannot reconcile.

5) Approaches to Government: Ever since the abolition of the Caliphate in 1936, Sunni Islam has been leaderless and there has come to be an understanding that religion does not participate in actual governance. (This is not a separation of church and state since the two can cooperate closely, but this prevents direct theocracy.) Shiites, on the other hand, have religious leaders called Ayatollahs who do attempt to have terrestrial authority and in Iran have actually achieved it.