McKenzie’s purpose is to provide readers with a way to accept biblical stories that can’t be literally true, thus preventing them from dismissing the Bible entirely. In this I’m sure he will succeed...
Do any amount of research into many of the stories of the old testament and you'll soon find they're not actually historical accounts. So what do you do? Dismiss the bible? Not necessarily. How about understanding what the message behind a story is? As JW's we were taught a fundamentalist, literalist interpretation of the bible and it can be hard to see any other way. But educated Christians are not so restricted. Real truth does not have to hide from information, and if God doesn't want you to lose your faith you won't by learning more about the bible.
How you cultivate your faith with the new knowledge is then up to you. But sticking your head in the sand is only ever a temporary solution; temporary just like the WTS.