While the Christian mythology is uninteresting from a philosophical perspective, it is illuminating from an historical point of view. At times of great change people seek comfort, and there's little more comforting than a myth that purports to make sense of an environment that's changed so much that prior myths have become less satisfying. During the Axial Age (roughly 3,300 years ago to around 1,800 years ago) an enormous amount of social change was taking place. All myths of the time reflect this, and one core struggle was between old notions of human sacrifice and more advanced notions of humane behaviors. Thus the Greeks pondered in their plays (and presumably in oral tradition) the question of what one owes to the gods, and the Christian mythology is an attempt to reinforce the notion that the old ways of human sacrifice have passed. Presumably this was necessary because the illiterate superstitious Hebrew goat-herders were still clandestinely performing such rituals. We see around the world similar attempts to come up with less inadequate myths, which is why at the same time Buddhism emerges in the orient. Myths are the encapsulation of a society struggling with important challenges; it's unfortunate that most people are insufficiently educated and lack the cognitive ability necessary to understand this fact, and instead imagine these fairytales to be real.