How would your life change if you knew for a certainty that God was dead?

In James Morrow’s novel Towing Jehovah, God’s mile-tall corpse is found floating in the ocean, and it explores the reactions of the people tasked with towing God’s body to shore for burial.

If we found God’s corpse floating face-down in the ocean and you knew for an absolute certainty that (a) there had once been a real God, and (b) that God was now dead, what would your initial reaction be? Horror? Relief? Existential despair? Joy? How do you think your life would change? How do you anticipate the rest of the world would react?