Certainly you can convince yourself of something based on meager evidence, but Pascal's wager is not evidence at all, it merely says you should will yourself to believe something which you don't. Of course most people, even - I would imagine - most atheists, don't find the idea of god nearly as unbelievable as the idea of an invisible pink unicorn, so they might not insist on nearly as much evidence to allow them to believe in god, but they'll still require some. In my experience, believing something on sheer willpower is simply impossible. Pascal might have tried to convince himself to believe in god because of his wager, but if he was actually successful, he must have had more concrete reasons for his belief.
Personally I think he should have stuck to probability, and not tried to meddle in metaphysics, since he clearly sucks at it, while he was rather good at probability.