man wat u r talking about.??Pakistan president is shia? yes there are very little people who think shia to be non muslims....but those ppl call shia non muslims who practically don't know about differences.Two decade ago there were alot issues ..but I m sunni and don't think so and mostly don't think so .
After demises of our beloved muhammad(pbuh) there were two groups of muslims.one were supporting hazrat Abou bakar(RA) to be first caliph while other group supporting Hazrat Ali(RA) to be first caliph..This second group who wanted to see Hazrat Ali(RA) the first caliph is 'shia'..Hazrat Ali(RA) was husband of Hazrat Fatima(RA) who was daughter of of our beloved Muhammad(PBUH)...Hazrat About Bakar(RA) was father of Hazrat Aisha(RA) who was beloved wife of Hazrat Muhammad(PBUH)....so a there was a conflict btw Hazrat Aisha(RA) and Hazrat Ali(RA) that was solved in battle field(not sure here)...so shia is a group that do not have a respect for Hazrat Abou Bakar,hazrat Aisah ,Hazrat Ummar(2nd caliph),Hazrat Usman(3rd caliph)...while we others have high respect for these people as they contributed alot in Islam and were the beloved people of our prophet Muhammad(PBUH).......
fundamentals of Islam
Sunnis and Shias agree on the core fundamentals of Islam - the Five Pillars - and recognize each others as Muslims.They both have same Quran-e-kareem .They both have:-
(1)salat (Prayer)
2) Sawm (Fasting) in ramdan
3) Zakát (Poor-due of 2.5%)
4) Hajj (Pilgrimage to Makkah)
6) Jihad (To Struggle in the Path of Alláh)
In 1959 Sheikh Mahmood Shaltoot, Head of the School of Theology at Al Azhar university in Cairo, the most august seat of learning of Sunni Islam and the oldest university in the world, issued a fatwa (ruling) recognizing the
legitimacy of the Jafari School of Law to which most Shias belong
Differences:
non shia shahadah (declaration of faith) states:-
Arabic translation:-
"
There is no god but Alláh, Muhammad is the Messenger of Alláh"
while Shia shahadah is:-
"
There is no god but Alláh, Muhammad is the Messenger of Alláh, Alí is the Friend of Alláh. The Successor of the Messenger of Alláh And
his first Caliph."
If you are already familiar with standard Sunni beliefs, you will immediately notice the addition to the shahadah regarding Imam Ali (ra), cousin of the Prophet (pbuh).
They have some thing added...although we admit Hazrat Ali(RA) is the friend of Allah and the successor of messenger of Allah.but he was not first caliph and they consider Hazrat Ali(RA) first caliph.....we also object that why they have appened declaration of faith.....we call it addition in deen.
Practical Differences
On a practical daily level, Shias have a different call to prayer, they perform wudu and salat differently including placing the forehead onto a piece of hardened clay from Karbala, not directly onto the prayer mat when prostrating. They also tend to combine prayers, sometimes worshipping three times per day instead of five. The Shias also have some different ahadith and prefer those narrated by Ali and Fatima to those related by other companions of the Prophet (pbuh). Because of her opposition to Ali, those narrated by Aisha count among the least favored. Shia Islam also permits muttah - fixed-term temporary marriage - which is now banned by the Sunnis. Muttah was originally permitted at the time of the Prophet (pbuh) and is now being promoted in Iran by an unlikely alliance of conservative clerics and feminists, the latter group seeking to downplay the obsession with female virginity which is prevalent in both forms of Islam, pointing out that only one of the Prophet's thirteen wives was a virgin when he married them.
but to add
But not all shia consider muttah to valid.Those living in Iran practice but i guess at small scale
http://www.islamfortoday.com/shia.htm