i will try to answer this question .
why bible at the first place wasn't in arabic?
or torat ?
God choose many languages to tell the people to worship him
and the choice was the arabic for quran because Mohammad (PBUH) was arabic , not like jesus , or moses or Ibraham . so God send the holy books by the prophet language.
And the interesting thing that arabs those days were very powerful in arabic language "if they want to courage ,they say poem with a very powerful words, if they want to humilate some one they will say poem....etc"
so it was a miracle by itself and you can see many people at that time converted to islam because the magical power of these words.

just like the wizards at the time of moses , when they saw the steak turning to a snake , they immediately knew that wasn't a magic and a trick they could do(and they were the experts ;) ) but it is something above their silly powers
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"It could be a picture
It could be a medicine
it could be a bullet
depends on how you see it"