Exactly, it also depends on the wording of the questions, I believe in Evolution, but I wouldn't say that I can rule out entirely the existence of some kind of Deity, partly because scientific method will not allow me to rule it out entirely until it's been wholly disproved and partly because, in their heart, just about everyone believes in this kind of Myth mash.
Under the terms of that poll, this would make me 'not believe' in Evolution, which is wholly untrue, I believe in infinite possibilities, but that doesn't make me religious, maybe it makes me hopeful, but then, who isn't, and I certainly don't believe in either a 'creationist' kind of God or a 'Judgemental' kind either, I don't feel any urge to pray to a Deity to fix my life, because that's simply trying to remove responsibility from myself.
If you include people who support evolution, but refuse to rule out God entirely, then the numbers move to 78%, which I could accept.