What caused the split was Muhammad's death in 632.
the Sunnis are the majority and the shiites are the minority.therefore the numbers of Sunnis are more than shiites populations.
Answer 1Yes. However, there was no real split between Shiites and Sunnis. It is just some different views over some side issues that are not critical.Answer 2No. The split between Sunnis and Shiites occurred nearly 30 years earlier when Abu Bakr was elected by the Shoura Council to the position of Caliph against the will of Ali's supporters. Those supporters rejected the decision of the Shoura Council and became the Shiites. The Battle of Karbala crystallized this division since Ali had, by then, been assassinated, and his son Hussein (who was the next candidate supported by the Shiites) was butchered by the Caliph Yazid I without Sunnis rejecting Yazid's right to the Caliphate.
No, Shiites outnumber Sunnis in Iraq. However, Sunnis over the world outnumber Shiites. World statistics is that Sunnis Muslim world percentage is 85% of total world Muslims. While Shiites are less than 15%. Refer to question below for more information.
No They are not Sunnis. They are Shiites.
The Sunnis are of bigger population. Of world Muslims, 85% are Sunnis.
Shiites and Sunnis. However, they are not splits as for example in Chritianity different denominations. Sunnis and Shiites differe in minor Islam details. Refer to question below.
Sunnis and Shiites
Both Shiites and Sunnis are right Muslims. They differ in minor issues that are not relevant to the basic Islam rules and instructions. Refer to related question below.
Shiites and Sunni are two main schools in Islam religion. Shiites are Muslims as Sunnis are Muslims too.Shiites and Sunnis are both Muslims and have different views in some minor and side issues.They are not different as the Catholics and orthodox for example.Both Shiites and Sunnis recite the same Qur'an, believe in same prophet, practice same ritual worships, and go to same places for hajj (or pilgrimage).Refer to related question below.
Shiites and Sunnis
The global Muslim population is approximately 85-90% Sunni and 10-15% Shia. The exact ratio may vary by region.