The thing is, atheism really isn't about "faith." For me, at least, it's about not having any reason to suppose the contrary. Throughout human history, people have invented gods to explain things they didn't understand -- weather, fate/chance, the origins of the universe, why bad things happen to good people. The thing is, the more humans learned about the world, the fewer things these gods were directly responsible for. We know why it rains now, and what causes earthquakes, and why the sun rises every day. We don't know everything yet, but it seems far more likely to me that the trend will continue, that things we once attributed to "God" will eventually be discovered to have wholly natural causes, rather than that this time, we've hit on the first example of real divine intervention. That's my take, at any rate.