Oh I already know it, but the point is nothing is for sure. That's like saying there's no planet in the universe that can support life, earth is the exception, and I'm sure not the only one.
The whole of science, philosophy, relgion and so forth exists in a paradigm of uincertainty. Take science, any science you like....say physics. Any new theory in physics is, by it's very definition, wrong. It's just less wrong than the last theory.
The same is true of religion. There have been alot of different takes on God, and probably no one theory of god, no one practice of religion, is right. They're just differently incorrect.