First problem here: clouds are not water vapour. They're droplets of condensed liquid water suspended in the air.
Second: you still don't have a point. Clouds have long been recognised as one of the bigger unknowns, in that they have effects in both directions: they both very effectively trap IR (the primary reason why cloudy nights are generally warmer than clear ones), but they also scatter incoming light. Completely contrary to your insinuations, coming to terms with them has been an active area of research for decades, and substantial progress has been made in narrowing down the magnitude of their effects.
Your line of argument here is very much akin to the famous "God of the gaps" of creationists: ignore all of the solid, highly detailed mechanism-based science, point to one of the not-yet-clear areas where research is ongoing, and say, "Ha! See - it's all wrong!" As the creationists learned (well, some of them at least), this argument tends to backfire spectacularly in the long run as those gaps are filled.
