See, the verses say that the fool says there is no God - but he only says it in his heart. And the rest of these psalms show the result of such folly - living as if there is no God produces nothing good, to say the least. The fool of the psalms simply pretends there is no God, and proceeds to live like it.
And yet, even in his insane wickedness, there is no indication that the fool would actually be stupid enough to say there is no God. He wishes there is no God, he lives as if there is no God, but to say it out loud? Even that seems to be too ridiculous for the fool.
But in the race towards insane depravity, the modern atheist leaves the biblical fool in the dust. In his wicked quest to spread his rage against his Creator from his own heart to the public, there is nothing so obvious he won't deny it, no line so clear he won't cross it, no rationalization so flimsy he won't cling to it and bet eternity on it. (Case in point - Stephen Hawking. But that'll have to wait for next time.)
So perhaps I owe an apology to all you fools out there. Sorry 'bout that. But you still desperately need to repent.