Just read the 4 major shia hadith books should be enough. And I don't want to go into detail as I'm sure many are going to get seriously offended if I do about the major differences. Just a quick summary of some. They believe the current Quran they have is not the actual Quran, but an altered Quran. The real Quran is with the hidden mahdi. There 12 imams are of higher stature than any prophet, imam controls the universe and decides who goes to heaven and hell. Mutah is legal, Ziyarah of graves comes first then Hajj if you feel like it where also they don't pray behind the imam there. There shahadah is different which includes belief in imamat as a condition of becoming a muslim. After the prophets death all sahaba apostated save a "choosen few" and Khulafa rashideen are not among them. So on and so forth.
I'm not a professor so if you want references and qoutes I'm sorry you are all out of luck. My opinion has been formed over years of reading and listening. I'm sure I've forgotten more about shia-ism then I can remember.
You are free to live in your delusion rosy world of Iran Pakistan Bhai bhai.
1. Just read the 4 major shia hadith books should be enough.
it means you do not have any proof. it is just like saying just read encyclopedia and you will find out. do you know how many volumes are those 4 shia hadiths books, those of hundreds of volumes and you are saying just read those,
2. They believe the current Quran they have is not the actual Quran, but an altered Quran. The real Quran is with the hidden mahdi.
200% wrong. there is no such belief in any of the muslim sects against the validity of quran. there is no any references from any sect which says that any single verse in this quran is extra added or missing. it is jahil mullah propaganda. read by yourself and do not believe anyone who looks like an alim. or at least listen to someone whose credibility is not questionable and every sect has such true ulma, the quran itself guarantees that Allah will protect it till the end of world.
إِنَّا نَحْنُ نَزَّلْنَا ٱلذِّكْرَ وَإِنَّا لَهُۥ لَحَفِظُونَ
3. There 12 imams are of higher stature than any prophet, imam controls the universe and decides who goes to heaven and hell.
Shia believe in imamat of 12 leaders and consider them masoom (not sinners). but never say that they control the system of world, it is again mullah propaganda, those who believe on such can not be muslims and they are called nuseris just like khawajis who labelled Ali as deviated from the right path after the war of Siffin. both khawarijis and nuseris are extreme and both of them has nothing to do with islam. do not mix things. again study not listen to whatever mullah says. ask them for valid references.
4. Mutah is legal, Ziyarah of graves comes first then Hajj if you feel like it where also they don't pray behind the imam there.
Mutah is legal in Shia islam but its interpretation is always been wrong, this nikkah is just like a normal nikah but it finishes after a decided period of time. there are differences in ahadis about it. some ahadis says it was practiced untill the time of second caliph and then it was banned and some says it was banned during the time of holy prophet. so shia says when the holy prophet did not ban nobody is entitled even shia imams can not change a rule after the holy prophet while sunnis think that it was banned during the time of fath e makka. so this is one differences. Ziyarah of graves in shia islam is not a wajib but Haj is a wajib rukun if islam in both shia and sunni. again it is propaganda and hundreds of thousands of shia performs hajj every year, if you do not believe just check the statistics and you will find out the reality. and everyone offers prayers after the imam during hajj. and i have myself studies shia ulma fatwa that anyone can offer prayers behind any immam who do not consider any of other sect as kaffir. if anyone be it shia or sunni mullah considers any other sect as kaffir then nobody should offer prayer behind such person, as he himself is not a true muslim.
5. There shahadah is different which includes belief in imamat as a condition of becoming a muslim. After the prophets death all sahaba apostated save a "choosen few" and Khulafa rashideen are not among them
shahadah is same in all muslims. shia has belief in imamat and it is not a condition to become a muslim but condition to be a true momin in shia islam. so what it is a difference. shia does not consider khulafa as apostate but do consider that Ali was the rightful person to lead the muslims after the holy prophet based on the event of ghadir. those who believes khulafa as apostates are sinners and deviated just like the nuserres and khawarijis.
6. I'm not a professor so if you want references and qoutes I'm sorry you are all out of luck. My opinion has been formed over years of reading and listening. I'm sure I've forgotten more about shia-ism then I can remember.
so you yourself agreed that your opinion is formed over years of reading but you do not have a single references for all those false claims. in a nutshell your net research result is zero. just reading online on social media and listening to video clips always leads to disaster. if you are really interested to find out if all the above mentioned are true then you really need to read authentic books or talk to true ulamas. every other jahil mullah who ahs been to a madrisa for 5 years has the islamic knowledge same as a matric fail boy knows about sciences and technology.
7. You are free to live in your delusion rosy world of Iran Pakistan Bhai bhai.
Allah knows who is in delusion. I am satisfied with being brothers with all sects of islam be it pakistani, irani afghani arbi, turki or XYZ.