Read the text (any text!) and consider:
Do the characters have an articulated belief system?
How is it articulated?
What purpose does it serve in the narrative? (does it play a role in driving the plot?)
What do the characters do for their beliefs? What are the characters willing to do for their beliefs? (is there some judgement the reader is invited to make about the belief because of what the character does/is willing to do?
How do their beliefs support/influence their relationships?