This question is asked to motivate action. It can be translated as a statement. Alternate translation: "We should not stay here." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Here "become silent" means to die. Alternate translation: "let us die there" or "let us wait for our enemies to kill us there" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Here "silence" is a metaphor for condemning to death. Alternate translation: "because Yahweh our God has condemned us to die" (See: [[rc://en/ta/man/translate/figs-metaphor]])