The Quran cannot be Translated

In discussions with Muslims, this situation sometimes arises when you make a good point:

You are asked aggressively, ‘do you know Arabic?’ Then you are told triumphantly, ‘You have to read it in the original Arabic to understand it fully’.


This causes us to ask some questions:

• How can Muslims claim the Quran is a revelation for all people when only a minority of people worldwide understand Arabic?
• The Quran quotes people who never spoke Arabic.  Isn't the Quran already in part already a translation in its original Arabic?