They are Muslims. It is irrelevant to think about which sect they belong to. No sects in Islam with same meaning as in Christianity. The sects in Islam are more or less different schools or different groups that differ only on minor historical issues.
Iran is a predominantly Shi‘i (شيعي) Muslim country. They follow what is called the "Twelver" or "Ja‘fari" (جعفاري) branch of Shi‘ism.
Iraq has been majority Shi'a for over 500 years and many Iraqi Shi'a fought in the Iraqi Army against Iran. However, Saddam Hussein and the higher echelons of the Iraq government were Sunna.
In July 2006 estimate Iraqi population is above 27,000,000. The religious compisiton in Iraq is: Muslim 97% and Others 3% The Muslims here are divided in two sects: the Shia 60% and the Sunni 40%.
No, it is not.
Muslim, no sect
Islam is not a sect. It is a religion, which contains sects.Members of the Islamic religion are called Muslim. The major Muslim sects are Khawarij, Shi'a and Sunni. Each of those sects have sects.
Druze are a Muslim sect.
They fall under a sect. of the Muslim faith.
Sunni
Sunnis are the largest sect even though they are a minority to the Shiites in Iraq
Over 99% of the Afghan population is Muslim: approximately 80-85% follow the Sunni sect, 15-19% are Shi'a, and 1% other.
Iraqi Christians celebrate Christmas unless their sect frowns on it, as many Christian sects do.