The two main branches of Islam in Iraq are Sunnis and Shiites. However, both branches share many common Islam principles and rules. Refer to related question below.
the main country of shia is Iran and Iran has developed in many areas of technology.
About 98% of Iran's population of 77,176,930 are Muslims: about 7,560,000. Please see the link.
Islam followers (Muslims) are from many countries like Egypt, Iran, Saudi Arabia, Pakistan, Afghanistan and many western countries.
Islam has many branches and denominations. It is, in this way, like Christianity. There are several main branches of Islam and several important small distinct groups. The major two branches or schools in Islamic religion are Sunnis and Shiites. Additionally, there are Sufis and Kharijites/Ibadis. Some of the small but religiously important groups are the Druze, the Dervishes, and Ismaili Islam. There are also several somewhat important sects and movements, such as Wahabiism, Moorish Science, Nation of Islam, and the Qur'anists.
while western religions are centered on the belief in one god
there are many in Islamic countries. for example Al-Azhar university of Egypt is main center for Sunni Islam and Qum in Iran is main center for Shia Islam.
there are 2 main groups shiites and sunnis then there are branches within each
Ka'bah in Mecca, Mosque of the Prophet in Medina, city of Mashad in Iran, city of Qom in Iran, Jerusalem (shared by all Abrahamic religions), and many other places.
In theory, yes. In practice, not so much. And remember that there probably are as many branches of Islam as there are varieties of Christianity. Only a few of them are violent.
People from Tehran are mainly Shia Islam adherents. however many other religions are present in Tehran For more information see http://en.wikipedia.org/wiki/Tehran
Islam is the official religion in many countries e.g.(Saudia Arabia ,Iran ,Yemen,Egypt,Jordan ,Syria,Morocco, Algeria, Tunisia ,Pakistan..etc)but Saudia Arabia especially is made (the holy Quran )its charter ,and all problem answered by Islamic laws only. Iran and many countries also pracrice Islamic laws in most of its problems .