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Sunni Muslims or Sunnis are a type of follower of Islam, the other main division is the Shiitess, worldwide Sunnis are by far the largest group. There are some theological differences between the two but an important difference is that Shiites believe only men who are directly descended from Mohammed can rule the faithful while Sunnis believe Muslim leaders do not need to be descended from Mohammed. Both groups expect men to lead.
Sunnis are varied, they have different leaders with slightly different interpretations of Islam. Sunnis vary and include the warlike Wahabisto connected to Al-Qaeda. Sunnis also include the peaceful Sufis.
Parallel with Christianity
There are some theological differences between the Roman Catholic Church the Greek Orthodox Church and the various different Protestants/Protestant groups but a very important point is who does and who does not accept the authority of the Pope.