Did you notice that the martial arts they used for bending is really off? The bending isn't great at all. The effects are nice. But only a few motions are satisfying.
If something presents important morals to people in a way that orients them properly then it’s serving a similar purpose as the Bible. In fact, it’s usually the case that those morals are the same Biblical stories or lessons reskinned in a different format as most stories are. What’s wrong with his use of Biblical in that context?