Assalaamu-Alykum
Brothers and sisters i belong to Shia school of Islam
All shias believe in only one Quran protected by Almighty Allah , Our scholars from Sh.Suduq (300a.h) to Imam Khomeini all have said the Quran we have is same which prophet ( pbuh) Lefted for his ummah but unfortunately in Sunni shia polemic I am seeing both accusing each other on all false reports and argumenI am giving a link of a book which will help all Muslims better understand the Quran Final testament from Allah subhana hu was tala
There is a book of Our great scholar where he has destroyed all arguments regarding infiltration in Holy Quran
you must read it , I m giving u link of book
" The Collection and Preservation of theQur'an by Ayatullah Sayyid Abulqasim al-Khui "
Link:
http://www.al-islam.org/tahrif_quranI hope the argument's presented by Ayatollah Sayyid Khui will help you to defend Islam the only true Religion from Almighty ALLAH S.W.T
peace be upon our prophet s.a.w the last messenger of Allah and upon his Progeny and upon his companions