The quran CONFIRMS the old testament btw (for any muslims reading here):

Surah 3:3 says torah and gospel are allahs word, Surah 2:89 says the quran came to confirm the book J and christians already have (not some strange gospel that magically disappeared from history) and Surah 18:27 says no one can change the words of allah. <-- nothing in the quran says the bible has been "changed", but instead it BINDS YOU to what the bible says.

The bible holds authority over the quran.

Besides, in islam you have tawheed. Example: The quran is (supposedly) the eternal word of allah, the eternal word of allah coexist beside allah and will become a white man that argues with allah and sends black people to hell. Here i count atleast 2 eternal divine seperate beings, allah and his word, which acording to islams logic are 2 gods, and thereby making islam polytheistic. I dont see any ECHAD here, even though you use the word TAWHEED for this.