Not necessarily.
what do you mean by Not necessarily.? the question was simple enough to give "Yes" and "No"
what is their(shia) book? Is Quran not their book?
again the same question to you A Muslim ..
I've heard of the Shi'as making their own Qur'an with added verses and chapters in attempt to show that it has been changed, (as they believe a man from a cave will reveal the original Qur'an). They also have their own books, (the equivalent of this in Sunni Islam are the Hadith's). Here are a few good reasons to why I am against the ideology of Shia'sm: https://www.youtube.com/watch?v=wEWtPnPPT18 so? you can hear lot of junk from sunni Islam and from other faith and faith heads ., so what?
Islam is based on Quran., ISLAM MUST BE BASED ON QURAN ., period....