No, Atheism is not a faith, nor is it naive/ignorant.
Consider Bertrand Russell's teapot example. Russell asserts that there is a tiny undetectable teapot in orbit around Jupiter. He says that to believe in the celestial teapot takes pure faith. But he asks if to disbelieve in the teapot also takes faith. His conclusion is no, since the teapot is simply a proxy for anything that we can imagine but we have no evidence for. His question is how does the celestial teapot differ from the God of Abraham in that respect.
Or as Richard Dawkins says, "We are all atheists for one god or another. For example, probably none of us believe in Zeus. He simply claims to believe in one less god than Christians do. Is that faith or simply the lack of faith?
Richard Harris was on Real Time this week and he said to Bill Maher that atheism is contentless. I can understand his point. My disbelief in the celestial teapot is also contentless. Since there is no celestial teapot, I have no dogma or doctrine about my disbelief in it.
As for me, I am a Christian, however, my belief is pure faith. Since there is no empirical evidence of the God of Abraham, I don't insist that those who don't believe in God have a different kind of faith. To say so pre-supposes that I am right about my faith and they are not. It is a kind of faith bigotry.
As a trained scientist and engineer, I do have to add that to insist that empiricism is a path to ultimate truth is indeed a kind of faith, since there is no evidence that this is true. Scientific theories are astonishingly useful, and their massive predictive powers imply that they are "on to something". In fact, I insist that there is nothing known with any more certainty than our well established theories.
However, the fact that even well established theories are always considered provisional, implies an endless succession of theories getting replaced by ones with more predictive power. As Thomas Kuhn says in The Structure of a Scientific Revolution, that theories are ultimately replaced by new theories which seem to bear no resemblance to the ones they replaced. He sees this as evidence that there is no convergence on universal truth. There is only an improvement in depth, range, and accuracy of prediction.
Even though empiricism has been the most successful intellectual achievement in the history of man, one has to wonder if one can base all one's knowledge of the universe on it alone. But then one has to answer the question, that without empiricism, how does one discern anything about a non-empirical notion? Since there is no verification, which notion is valid and which is not?
Not very satisfying, is it? Epistemology is a bitch.