You'll notice that the cowboy on the left is black, while the cowboy on the right is white, with contrasting background of white and black, respectively.
That remains to be seen. Until then I'll stick with the stuff we have evidence for.
That also remains to be seen, although, I'll admit it probably won't happen in our lifetime.
To quote Dawkins;
'We're working on it'.
Depends on what you mean by 'believe' in. I'm not that well versed in Quantum Physics (Meow Mix might be a better bet there) but I know that both of these concepts are useful in a mathematical sense. I don't know, however, if they actually exist in a physical sense. I'd have to read up on that first.