Ok, my collegiate major was a BA and then MA in History. My focal points included Islamic Civilization.
I hate to break it to you.
Shia Muslims believe that the descendents from Muhammad through his daughter Fatima Zahra and his son-in-law Ali (the Imams) were the best source of knowledge about the Qur'an and Islam, the most trusted carriers and protectors of Muhammad's Sunnah (traditions), and the most worthy of emulation.
In particular, Shia Muslims recognize the succession of Ali (Muhammad's cousin, son-in-law, the first man to accept Islam — second only to Muhammad's wife Khadija — the male head of the Ahl al-Bayt or "people of the Prophet's house") and the father of the Prophet Muhammad's only bloodline as opposed to that of the caliphate recognized by Sunni Muslims. Shia Muslims believe that Ali was appointed successor by Muhammad's direct order on many occasions, and that he is therefore the rightful leader of the Muslim faith.
The Sunnis disagree. The Sunnah (the example of Muhammad's life) is the main pillar of Sunni doctrine, as recorded in the Qur'an and the hadith. Sunnis believe that the first four caliphs of the Muslim community were the rightful successors to Muhammad. They hold that since God did not specify the leaders of the Muslim community after Muhammad, they had to be elected.
Directly from the US Government:
Approximately 15-20% of the world's Muslims are Shia. There are an estimated 130 to 190 million Shia Muslims (including Twelvers, Ismailis, Zaidis) throughout the world, about three quarters of whom reside in Iran, Pakistan, India, Iraq, Azerbaijan, and Afghanistan.
A large portion of the world's Shia live in the Middle East. The Shia Population of the Middle East constitutes a majority in Yemen, Azerbaijan, Iraq, Bahrain and especially Iran, where 90% of the population is Shia, giving it the highest percentage of Shia Muslims of any country in the world. In Lebanon Shia form a plurality, and they remain as significant minorities in Afghanistan, Syria, India, Pakistan, Turkey and Yemen. Among the smaller Persian Gulf states, Qatar, Kuwait and the United Arab Emirates also have significant Shia minorities, as does the Eastern Province of Saudi Arabia.
About 20% of India's Muslim population is Shia, and significant Shia communities exist on the coastal regions of West Sumatra and Aceh in Indonesia. Shia presence is negligible elsewhere in Southeast Asia, where Muslims are predominantly Shafi'i Sunnis.
Also..... for the sake of educational purposes..... there is no Shi'ite religion. There is no Sunnite religion either. Shia and Sunni are the branches of Islam, and a Shi'ite and a Sunnite are the proper names of a follower of one of the distinct brances of Islam. Also, a Muslim is a person, not a religion. The religion is Islam.
Additionally, there's more than just Shia and Sunni Islam. There are the Suffi (Suffi'ite) , Khariji (Kharijite) and Druze sects.
There are plenty of zealots in all the branches of Islam. (All the hijackers on 9/11 were Sunni).
How does crow taste?
See, now I understand the ignorance of where you come from. The Shi'ite muslim religion only represents 10% of the muslim population in the world. Guess where they all live. Ok, i'll tell you: Iran. They have openly declared war on all jews, secular governments, and anyone who believes in any western civil philosophy. Gee, sounds a little extreme, don't ya think? They are the fundamentalists of which you speak. All of the lovely Zealots of our age, including Al Sadir and Ahmedinijiad (spelling not perfect), are Shi'ite muslims. now what was that about immature intellect. I think the saying goes take the log out of your own eye.