What does Judges 6:31 mean?

But Joash said to everyone standing around, Are you really going to fight for Baal? Are you going to save him? Anyone who stands up for Baal will be dead by morning! If Baal is a god, let him defend himself when someone tears down his altar. Judges 6:31 - Modern Text Bible

(Joash defends his son, arguing that if Baal is truly a god, he can take care of himself.)