A word of caution: the "one is right and everyone else is wrong" is a Fundamentalist notion, even if you don't think it's the Fundamentalists themselves who have it right. Logically, it seems like it makes sense, but practically, here's what I consider more likely.
If there is any one viewpoint that is right and all the others wrong, my bet would be the atheistic skeptics. Their model is generally pretty stable, though it starts getting contrived once you try to explain paranormal phenomena.
More likely, there's some truth out there that no one has entirely correct or entirely wrong. If there is a great divinity, it's highly improbable that there is any one religious group that has with perfect precision described it's entire cosmology and method of working.
The most likely explanation, and what I consider to be real, is that they're all at least partially wrong. Some are more wrong than others. The odds of someone figuring it out perfectly, given what it would entail, is about like my randomly guessing the winning lottery numbers of every state or national lottery on Earth from now until some five billion years from now, when the planet falls into the sun. Still, "it's five numbers, each between one and forty" is a lot better a guess than "it's a color, two sounds, and a type of fish."
![Smile :)](./images/smilies/smile.gif)
Taking a Gestalt approach, since it's the "in" thing...