What is the different between Sunni and Shiite Muslims?
Sunni Muslims believed that Muhammad’s successor should be chosen based on the best fit, Shiite Muslims thought that it should be someone who was chosen based upon relationship to Muhammad. Today, Sunnis have more of a focus on following the Quran, while Shiites are more focused on following the words of the authorities. So in that way you could think of the difference between Catholics and Protestants.