There isn't a single theory that includes a god, that isn't equally (in) valid when the «god» is substituted with any other mythical being or force. (religion.blogs.cnn.com)
You've probably heard of the attempts at unifying quantum physics and relativity and finding a single theory that can explain everything, did you? (religion.blogs.cnn.com)
On another dimension, though, symbolic universes are distinguished as being the most theoretically elaborate: they consist of whole systems or traditions rather than single theories or even simpler, more discrete statements such as an explanation or proverb. (religion-online.org)