Below pieces of information are collected from various reliable sources. Between 10% and 13% are Shia Muslims, and 87% to 90% are Sunni Muslims. Sunni Muslims are also present in more countries and regions throughout the world, whereas most Shia Muslims live in four countries: Iran, Pakistan, India, and Iraq. The vast majority of the 1.6 billion Muslims in the world are Sunni, according to a 2009 study by a Research centre. The conflicts erupted between Shia and Sunni Muslims due to the huge differences raised among them which goes back to the 7th century and the death of the Prophet Muhammad. Yet a spotlight has been shone recently on the differences between the two branches of the religion as the number of clashes between both groups has intensified. The separation of the two groups started after the death of the Prophet Muhammad. T he majority believed that his rightful successor was his father-in-law and close friend, Abu Bakr, but a small group believed the Pro...