To respond further to the above-- if somebody tells you a lie, and you recognize it as such, does that make you either a believer in the untruth of that lie or someone who is trying not to believe the lie? Maybe so, but doesn't that needlessly complicate things? What about the person who hasn't even been told the lie? They don't fall into either category.
Furthermore, if someone is a Christian, say, and they are told about Buddhism and don't believe it, are they then in the position of either believing in the untruth of Buddhism, or of trying not to believe in Buddhism? Ordinarily nobody presumes to impose this philosophical connundrum upon Christians (or Buddhists, for that matter.)
But there is a kind of subtle bigotry that the religious have towards atheists, that they hope to undermine their position by loading them up with this silly excess baggage.
Why not just let Christians be Christians, Buddhists be Buddhists, and atheists be atheists?