Can you say anything about time without resorting to metaphors?
No, indeed. You need to use spatial (as in a "long" or a "short" time) or movement (which imply both time and space, such as in "time goes by") metaphors.
The problem with the signifier "God" is that it refers to an absolutely singular signifié about which any assertion must be barred as soon as it is uttered: God is a Father and he is not a father. He is a King and he is not a king. He is a Person and he is not a person. He exists and he does not exist. He is everything and he is nothing. The problem is well perceived in the negative or apophatic theology of the Middle-Ages as well as in the dialectical theology of the 20th century. At the end of the metaphysical road, there is no difference between theist and atheist: any kind of belief, or religion, has been lost along the way. As Nietzsche could have said, God eventually kills himself by the same critical weapon he used to kill the gods in the first place.
(How many metaphors in the last paragraph? )