This can be stated in active form. Alternate translation: "The animals and the birds are gone" or "The animals and the birds have all died" (See: [[rc://en/ta/man/translate/figs-activepassive]])
Possible meanings are 1) The people are saying that God does not know what things will happen to them in their future or 2) God is unaware of their sin. Alternate translation: "God does not see the sinful things that we do"