You won't win the battle. The Quoran can only be understood by people who speak Arabic. It's their shield of defense when discussing what the Quoran says.
At first you'll think it is comedy, then realize it is totally serious.
And make sure both understand the same definition of the word "is" before you start talking about child brides, killing infidels, etc. ...
Don't really understand the logic of this unless it was meant as sarcasm. The koran was not written in arabic!