kyas
The point is "not" that he has no son or wife. If you read the passages from your surah's, the point is "can God have a son". The Quran contradicts itself on this point.
The surah that describes the Christian trinity is not at my fingertip, but that can be your homework. Your Quran most definately describes what it believes Christians to believe, and in doing so, makes a HUGE mistake.
refer to my original post on this thread for the details.