Atheists are optimists. They are holding onto the belief that something can indeed come from nothing. To be an atheist absolutely means that you believe in creatio ex nihilo...creation out of nothing. And given the 200 years of modern scientific research and evidence, there isn't one shred of evidence to suggest that something can come from nothing. And in fact all the evidence is contrary to this belief. Rather the evidence strongly points to the fact that with nothing you get nothing, that change requires something to cause, something to allow, something to initiate. And if there is nothing, then there should always be nothing, as there is nothing to change nothing into creation.
Now some atheists might suggest an infinite cycle of universes, which is still problematic. There cannot be an "infinite" cycle for two reasons. There has to be a first cycle. Its unreasonable, irrational and illogical to argue that there is no "first" cycle. The problem of infinite regression is real. There has to be a cause for this universe, and there would have to be a cause for the cause of this universe, just as there would have to be a cause for the cause of the cause of this universe. A "first cause" must exist to set it all in motion, and to believe in some natural first cause (not god) requires faith in creatio ex nihilo.
The second problem is that for an infinite cycle to exist there has to be infinite energy or perpetual motion. Either there exists infinite energy for the cycle to continue, or the cycle is 100% efficient, and no energy is lost due to friction or heat or entropy...ie perpetual motion. There is no evidence for perpetual motion or infinite energy and yet there is plenty of evidence against such notions.
To be an atheist means you have to believe in ideas and concepts that not only have zero evidence for, but have lots and lots of evidence against. And that takes faith.