What are the ethics and morals of the people discribed in the book?
That is broad question, but one important moral that is brought up is the danger of magic and the importance of proper views on religion.
The magic question is very interesting, because the Romans were preoccupied with the dangers of magic. They even passed laws about this, because they saw it as so dangerous. And when you look at Greek and Roman literature, magic is always cast in a negative light. For example, Medea is the magical par excellence.
So, think of a culture that fears magic. What type of morality emerges from this type of culture? For one thing, conformity to social norms seems to be important. Anything that is too much outside of the box is shunned.