I think there are a lot of people who think there is something "greater" out there, but that human's attempts to describe it have failed. These are people for whom the bible is NOT literal, but is merely a series of mythical stories with lessons in them AND attempts by rulers to control the people. For these people, religion is a search, not a destination. I can kind of get it, as opposed to traditional christians, which I don't get at all. The kind of person I'm talking about might use religious terminology, but is really on their own path of discovery. How common is this? I don't know, but I know several in person. They might call themselves christians, but when you delve into it, you realize that they are something not at all what a fundamentalist would call a christian.
Its a complex subject, and one I'd love to explore. Its easy to take potshots at fundies. Its much harder to understand the true seeker (whatever that means) who uses religious words, but isn't really religious in the way that this forum argues about.