There are heavier sources to read, but a basic one here on Wiki, which explains the division between Sunni and Shia muslims:

https://en.wikipedia.org/wiki/Shia_c...%20in%20Turkey.

You can follow the primary sources and speeches referenced here. But basically, Shias MUST have strict Islamic fundamentalists religious leaders as head of state, and the Koran defines the laws (Iran, Taliban in Afghanistan etc. ) This is why in these countries women get raped, stoned, prevented from working etc. Because it doesn't follow the Koran and it breaks the law. And because of that, these countries wage holy war on Christians, Jews and want to convert or oppress Sunnis. It is not as simple as saying "If you are from Country X you are this type". Because reality is that most Arab countries have mixed tribes. What matters is who are the elite and power brokers in that country - that defines their behaviour.

Sunni muslims can have a royal family or elected government (Saudi, Bahrain, Turkey, Morocco, Egypt usually). Islam and aspects of the Koran feature in life but do not define all the rules and values. You don't see people justifying rape or stoning of women, or preventing women working with this sect.) These are often friendlier countries to The West as they are generally more relaxed.