It's not fear. If you understood the meaning of that verse I quoted from your own fantasy novel, you'd know better than to think that. Particularly in light of the history of your delusional cult of genocidal superstitions' relationship with other actual religions.
He doesn't have anything but his own ego and angst. Our ranks are full of these types, unfortunately. Maybe they'll make good warriors when the time comes, if they can manage to constructively channel their anger. Big "if" though.