Is Shiaism really Islam?

The main teaching of Islam is Tauheed ; the oneness and greatness of Allah, the all knowing , all seing, all doing, powerful, Lord, Creator and Master of the universe. He gives life and death. He will decide who goes to heaven and hell. In Shiaism, Allah's attributes are assigned to Hazrat Ali. In Usoolul Kaafi, it is claimed Ali r.a will decide between heaven and hell (vol.1 p.197).

In jilaaul uyoon it says that Ali r.a claimed that ,"I am the owner of the day of judgement" Jilaa ul uyoon vol. 2 p.60 urdu version). On p.85 vol.2 of the same book , it is alleged that Hazrat Ali r.a said, " No momin , munafiq , mushrik and kaafir can die until I give the order." (naoodhubillah). The Quran teaches us to pray to and call to Allah in time of hardship and need, in Jilaa ul uyoon, a book of shias written by one of their most powerful scholars of all times, on p.66 vol.2 (urdu version ) it says , "In times of hardship, to call upon Ali r.a, is the sunnah of prophets and teaching of Quran (naoodhubillah).

The second most important teaching of Islam is belief in the finality of the prophethood of Muhammad sallallaho alaihe wasallam. Shias claim to believe that he was the last prophet but infact assign characteristics of prophets to twelve imams after Rasoolullah sallallaho alaihe wasallam. Infact they regard the imams not only to be infallible (m'asoom like prophets) but higher in status than all prophets. (Jilaa ul uyoon, vol.2 p.20).

The Quran is the last message of Allah to the whole of mankind, hence Allah the Almighty promised to safeguard and protect it. Muslims believe every letter of every word of every verse (among the 6000 + verses ) of every surah is under divine protection. Shias believe the original and complete Quran was 17, 000 verses (Usoolul Kaafi, vol.2, p.634) So according to shias, almost two thirds of the Quran has been lost against the divine promise of Allah.

Allah has forbiddden lying, indecency and zina in the Quran. Shias promote lying under the banner of taqiyah and promote zina under the name of Mutah, a temporary contracted marriage, i.e prostitution. So how can shiaism be compared to Islam.