They are like sheep with death as their shepherd, leading them to the grave. In the morning God's people will walk all over them, as their bodies lie rotting in their home, the grave.
David knew this would happen, and so he told us that Christ would be raised to life. He said that God would not leave him in the grave or let his body decay.
They don't worship the glorious and eternal God. Instead, they worship idols that are made to look like humans who cannot live for ever, and like birds, animals, and reptiles.