Why?
Well, this article will explain. HERE'S THE LINK
And HERE IS A LINK to an article telling about a book that is refuting Bell's book.
And to read an interview with Rob Bell, HERE'S A LINK
As you can see, there is a lot of discussion and controversy going on about this book and Rob Bell's views.
So, bottom line -- pay attention. Read between the lines when necessary. And be very careful. Sometimes views are disguised or covered over but they are still present and can wreck havoc on true Thelology if one is not careful.
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