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On the surface he seems to be well studied; he's certainly a good writer. But if you inspect Aslan's sources, they are overwhelmingly contemporary, making him a tertiary historian. He disregards decades of Biblical scholarship and takes interpretations that are convenient to make his points.
Got this book free from FirstReads on Goodreads. Glad I didn't pay for it. People will believe what they want to believe; that's why this is a bestseller.