You have to have self-belief to be Champion. I suggest since Red Bull and McLaren have taken every race victory since the opening weekend, that Alonso ought to tone down his public pronouncements.
However, Alonso has kept himself in the hunt for the title, it is not impossible. But it needs a significant improvement from Ferrari, and no more unlucky Safety Cars!
He should be thinking on those lines, it is better to think you'll win the Championship and be wrong, because if you think you won't win the Championship, you'll be right!