Final answer:
The cultural role of the Greek god Zeus included people praying to him for safety in war and Greeks dedicating festivals with theatrical performances to honor him.
Step-by-step explanation:
The cultural role of the Greek god Zeus, the supreme deity worshipped by the Greeks, encompassed various aspects of their society. One significant cultural role of Zeus was that people and soldiers would pray to him for a safe return from war. This highlights the Greeks' belief in Zeus' power and his role as a protector. Additionally, Greeks dedicated festivals featuring theatrical performances to Zeus, showcasing their artistic and cultural expressions as well as their reverence for their god.