"Some theists who accept the conclusion of the God as the source of ethics argument fail to appreciate its consequences fully. [William Lane] Craig is an example. One of his central themes is how awful it would be if God did not exist...Craig refers to the “horror of modern man” – facing life in (what “modern man” takes to be) a Godless universe. But if there can be no good or evil if God does not exist, then there can be no evil if God does not exist. So if God doesn’t exist, nothing bad can ever happen to anyone. The conclusion of the God as the source of ethics argument implies that there is nothing good about a Godless universe – but it equally implies that there is nothing bad about it either. If this argument is sound there can be nothing awful or horrible about a Godless universe. The short version of Craig’s self-contradictory message is “Without God there would be no value in the universe – and think how horrible that would be!”"
Erik Wielenberg, Value and Virtue in a Godless Universe, pp. 40-41.