spanner, it's a huge book, 960 pages, and it is disturbing to me at least because it strikes at the foundations of conventional Christian belief. Eisenman particularly acknowledges the assistance of Michael Baigent, a co-author of The Holy Blood and The Holy Grail, so you can get an idea of his sympathies. I think it is probably a great book, but I don't think I will finish it.
This is the very last line of the book: "Who and whatever James was, so was Jesus", so I might skip the middle bit !