You don't understand science. Scientific predictions can be wrong. Over time, the mass of accumulation of experimentation, facts, and results produces the body of knowledge of science. If there's a problem with our understanding of gravity, the Theory of Gravity is not thrown out the window; it is updated. After hundreds of years of studying gravity, with a massive amount of data points, experiments, etc., it's just not going to be wrong on most points - and even if it is, it doesn't make any of science's previous modelings of gravity to be unscientific.
The fact that it's hard to predict climate does not mean that the body of scientific evidence can be ruled out. We have evidence of dozens of years of Earth's average temperature not going up as much as some hypothesized. However, the data of the theories of AGW is only increasing and getting more accurate. There are now way more variables that are understood for the climate models. For example, and I promise this isn't an AGW crackpot theory, google the effect of airplane contrails after 9/11, when almost all airplane flight stopped, and it was found that airplanes probably provide a small "protective layer" in the atmosphere.
Science is not religion. I understand that you've probably come across people who treat it as such. But your post sounds very much like a religious and political argument, rather than a scientific debate.