In my opinion, our ignorance of the cosmos is too vast to commit to atheism, and yet we know too much to commit to a particular religion. A third position, agnosticism, is often an uninteresting stance in which a person simply questions whether his traditional religious story (say, a man with a beard on a cloud) is true or not true.
So I call myself a possibilian. Possibilianism emphasizes the exploration of new, unconsidered possibilities. Possibilianism is comfortable holding multiple ideas in mind; it is not interested in committing to any particular story. If you want to know more about this point of view, see the Wikipedia entry on the topic.
Here are a couple of photos from my TEDxHouston talk, "On Uncertainty". In this talk I argued why possibilianism is not only a hopeful position, but the most rational one.
And here's a talk on possibilianism that I delivered at the School of Life in London.
Not everyone is a fan of possibilianism. After possibilianism began to spread widely on the web, the neo-athiest Sam Harris wrote to ask me if I would like to publically discuss the idea with him. I had read some of Harris' writings and quite liked them, so I agreed. I was interested to understand where our positions were compatible and where they differed. But Harris' response (in the form of a letter to me on his blog) attacked possibilianism on the grounds that I was "confused", an "accomodationist", and "intellectually dishonest". I took the pugilism of his opening salvo as a indicator of the utility that I would get from attempting a meaningful back-and-forth dialog with him. (Strangely, as indicated by a later blog of his, he seemed surprised that I hadn't taken the time to write him back.) It's not that I don't admire his writing (I do), or that I don't value public debate (I welcome it). It's simply that, in this case, Harris' braggadocio appeared to be emblematic of the neo-atheist posture, and confirmed why I don't feel completely at home in that camp. In other words, when I received his overly-aggressive opening shot, I thought: "Tada. This is precisely why a third voice is needed."