The death of Muhammad split the Muslims over their belief about who should take over as their leader. The Sunnis believed that the person should be elected and the Shiites believed that the person should be a descendant of Muhammad.
Muslims were divided into two groups
There are shia muslims and sunni muslims in islam.
The two groups were Theravada Buddhism and Mahayana Buddhism.
Islam's two major sects are the Sunni Muslims and the Shia Muslims.
How about the Christians and Muslims
The ruthless assassination of the third Rightful Caliph Hazrat Usman RAU was the beginning and the most pathetic event of the brutal martyrdome of the tribe of the beloved Prophet SAW at Karbala was the hallmark. That was the most unforunate incident that became a cause of split, though the incident is deplored by all the Muslims.
The largest two Islamic groups are Shi'a and Sunni Muslims. These two groups now have quite different beliefs, but the original split was caused by the question of who was to succeed Muhammad. The Sunni's believe that Abu Bakr was his rightful successor, but the Shi'a believe that Muhammad chose his cousin Ali.
In the mid 600
The Mahayana and the Therauda
Mahayana and Theravada
Hinduism , Muslims
There are more than two groups of Muslims, but the dominant two sects of Islam (accounting for >99% of all Muslims) are the Sunnis and Shiites. To read about their differences, please see the Related Question below.