No seeing is not believing because your eyesight is based on relative perception, which is subjected to perspective and opinion. Our senses are not reliable, and certainly should not be used as a reliant tool for drawing truths.
The world around you is created by your perception of it, your ideals, your opinions and your morals. The reality that you see is created by your mind and how you perceive them. My reality is different then yours, and the only thing that we would be able to agree on is say the most smallest of the similar details - like whether that building we were talking about was an office building or not. We cannot decipher between relative facts, and universal knowledge, because it is all dependent on your perspective.
That's my opinion any ways.
Another idea to think about is colours - are they really there? Do some research into it and you'd be surprised to find that they really aren't.