Where are you. Have you guided dog to the Electrical switch(es) If that so. You need to find 3 peices of flesh, if you are at the fountain, just replay the message you got from the very beggining of the game (Dogs commando order) It should wake God Up.
If you mean the jail cell, I have the same problem. I restart the game and play the audio while pushing the Courier forward, very close to the cell facing Dog/God.