I thought of a great addition to the Holy Land chapters. Since Connor is frequently attacked by and/or saved by animals, I figure it should build to an all-out battle between dark animals, who bow to Satan, and light animals, who defend "Christ".
The dark animals are easy since they can each be possessed by a demon who know how to drive the animals into an attack. They do that with the hyenas at Capernaum. The light animals is trickier since Connor is the AC, not Christ. He can definitely make himself liked by animals, which he did a few times in the first draft. In fact, the whites doves even came to his rescue when he was attacked by the wild cat at the baptism site. Ditto for when the pratincoles saved the group from the demonic locusts.
It does beg the question how is Connor able to steer an entire army of animals to defend him? Obviously, he can't be in all their heads at once. The best way, which I think is already implied by the pratincoles and doves, is for him to be able to give off some "good" vibe that brings the unpossessed animals to his defense. I can also use some of the animals in the final battle of book 3.
I'm also thinking of giving Connor a dog throughout the trip in book 1. But I need to figure out what major contribution it can make to the story beyond merely giving a sick kid a dog, although it could reinforce the image of Connor as a sweet kid if his dog adores him. I doubt pets are allowed at the Western Wall in Jerusalem, though, not to mention at other tourist attractions, and in all the churches they visit.