Mulan:
I tend to agree with you. I'll even go so far as to say it is a pretty good book.
The problem is that it shows the shallow basis for ALL religion. Muhammed SAYS he is God's messenger. So does Jesus. etc.
The Bible , Koran, Vedas, etc. all have a mythical component. The main reason people believe those books is that they were born into cultures that traditionally accepted those books as sacred.
If JW's spent a year in that book they would definitely have honed their critical skills to the point where they would be a little more skeptical of their own beliefs.