In a recent radio interview, The Shack author, Paul Young, told the interviewer he did not hold to the traditional view of the atonement in that he does not believe Jesus Christ bore the punishment (i.e., penalty) for man's sins when He died on the Cross. Look at a partial transcript here.
He also stated, with regard to this topic: "I don't know if you're aware, but that's a huge debate that's going on in theology right now within the evangelical community." That debate, to which Young refers, is the new theology (or as we call it the new spirituality) that is entering Christianity through contemplative and emerging figures such as Brennan Manning, Brian McLaren, and Marcus Borg.
This "huge debate" states that a loving Father would never send His Son to a violent death on behalf of the sins of others. And while they do not deny that Jesus did physically die on a Cross, they insist that His death was not to be a substitutionary act wherein He was punished for our sins. Rather, they say, He was killed by man, not for man. And he was a perfect model of sacrificial servanthood. As Episcopal new spirituality author, Alan Jones, states, "Jesus' sacrifice was to appease an angry God. Penal substitution was the name of this vile doctrine" (Reimagining Christianity, p. 168).