About 80% of Muslims are Sunni, and about 15% are Shia.
Most Muslims in countries worldwide, including the US, are Sunni. Countries where Shias are the majority are Iran, Iraq, and Azerbaijan.
I believe that the majority of Iranians are Shi'a Muslims.
Most Bosnian Muslims are of the Sunni Sect and the Hanafi School.
The Shiite Muslims
They fall under a sect. of the Muslim faith.
Most Muslims belong Sonni group (or sect). However, there is no critical difference between the Sunnis and Shiites two groups or sects.see related question below for more information.
A member of a Second Adventist celibate sect that follows Johann Georg Rapp is a rappist.
Islam is probably the largest religious group in the US that practices polygamy, although most Muslims are not polygamist.
Sunni sect is the largest sect of Islam. Shia are in very less number. Sufi is not a sect. It is a way of life for some of the Muslims who seek pleasure of Almighty Allah by excessive prayer and devotion.
Ismali Muslims are a sect of Islam. They are Shia Muslim, and have different ideals to that of Sunni Muslims. They are less strict and practicing than Sunni Muslims.
Olive
The dominant sect of Islam is Sunnis (about 85% of total Muslims in the world). Refer to question below for more information.