Imagine a community called Storyville, where there are no religious institutions per se, but where various stories are circulated which we would call "religious." Let's say these are stories from the Bible, such as the story of Job. In Storyville, the questions might arise: Are these stories based on facts? Do they represent some features of the world or our history? Does the character of Job represent a real person who lived some time in the past? Does the character of God represent a real person who lived in the past?
Now the first denizen is annoyed. "How can I believe in God when I don't even know what sort of thing God is supposed to be? Without a coherent definition of "God," I can't believe in God." Our first denizen sounds very ignostic.
(See Theological Noncognitivism, Redux for a more thorough discussion of my point of view.)