How does the author portray the theme of religion in the novel, Meet the Austins?

In the novel, Uncle Hal's death leads Vicky to question her faith in God. L'Engle also portrays the family praying before meals and at bedtime. The emphasis, however, is more spiritual than religious as the narrative is more concerned with the development of the characters' personal beliefs than with their adherence to the tenets of any particular organized religion.