In "In the Garden of Beasts," Erik Larson explores the complexities of faith and tradition through a poignant exchange between a woman and an atheist. Reflecting on the Christmas season, she questions his participation in decorating a Christmas tree that symbolizes Christ's birth. Instead of defending the religious significance, he humorously dismisses the need for faith, implying that the celebration can exist outside religious constraints. This illustrates a shared appreciation for beauty and ritual, irrespective of belief systems.

As the characters engage in this festive activity, it highlights the intersection of personal beliefs and cultural practices. Their discussion suggests that festivities can hold different meanings for those involved, emphasizing that joy and beauty can transcend religious differences. This moment showcases how shared experiences, like decorating a tree, can unite people in a celebration that is more about joy and community than strict adherence to faith.