Part of the lure of the New Testament is the complexity of its central character — the mix of gentleness and zeal, strident moralism and extraordinary compassion, the down-to-earth and the supernatural. Most “real Jesus” efforts, though, assume that these complexities are accretions, to be whittled away to reach the historical core. Thus instead of a Jesus who contains multitudes, we get Jesus the nationalist or Jesus the apocalyptic prophet or Jesus the sage or Jesus the philosopher and so on down the list. There’s enough gospel material to make any of these portraits credible. But they also tend to be rather, well, boring, and to raise the question of how a pedestrian figure — one zealot among many, one mystic in a Mediterranean full of them — inspired a global faith.