A) It was written by a Christian seeking to strengthen the church, or
B) It was written by an atheist seeking to develop a counterfeit religion to undermine the true faith and weaken the church.
I don't think there's any doubt that someone truly versed in the Biblical gospel would conclude B. His stuff is wrapped in Christianesque language, but every aspect is designed to be just close enough to fool people and lead them astray from the true faith. So since his 'theology' is so close to what a devious atheist would develop, might as well treat him as such.
It seems I'm in good company with this observation. Ray Ortlund, a pastor significantly my better in so many ways, has made the same point with regards to the heretic du'jour, Rob Bell. And he's exactly right.