I agree that you can’t make yourself believe, despite the claims of some religionists that atheists have deliberately chosen to turn from God, or the claims of atheists that religionists have decided to delude themselves. I call it the “Deep Down In Your Heart” fallacy–if you believe something DDIYH, then obviously everybody else does too, and if they deny it, then they’re just kidding themselves.
I do not believe that I could sit down one day and decide to believe in God. I would have to have some kind of evidence–a personal experience on the order of Mangetout’s would probably do it. Nor do I think that a religionist can decide to be an atheist just because somebody tells 'em God Is A Lie. A person cannot choose to beleive. A person must be convinced.
Everyone, of course, has different standards for what will convince them.
On the other hand, we can be confronted with evidence or the lack thereof, or a logical challenge to an idea we hold dear, and we can choose to either shy away from it or to meet it head on. It’s a very uncomfortable to admit that your beliefs are vulnerable–it makes me feel physically squeamish sometimes to grapple with an idea that contradicts my well-tread habits of thought. And on the other hand, it feels very good to “prove” yourself right, to seize on a bit of evidence or simply on another person’s agreement and say, “See! My beliefs are true!”
I really do believe that living an unexamined life, philosophically or religiously, is hedonistic. You must grasp the bull by the horns, ask yourself the hard questions, and submit your beliefs to review by unpleasant people–whether you’re a religionist or an atheist. You should suffer and doubt and agonize, or else your beliefs are likely to be soft and weak and flabby and wrong.
Perhaps I should refer myself as a puritanical atheist after all. 
(Hey, here’s my 1000th post. I toyed with doing something special, but instead I find myself simply adding a post that people might find interesting to a thread about a topic that I feel very strongly about. Cool.)