Could be quackery, but there is this.
That article brings up an important point… just because someone is an atheist doesn’t mean that they necessarily believe there isn’t a spiritual or higher realm, or even a creator. I consider myself an atheist, but I am quick to clarify that I haven’t a clue what is beyond our ability to sense or reason, and there absolutely could be a creator. I’m quite convinced that there are things beyond our ability to comprehend, and that there is a lot more to the “universe” than we are capable of knowing.
I even am quick to admit that Christianity (or Islam, or Buddhism, etc.) might be right. It might be possible to communicate with the creator through some sort of spiritual method, such as prayer. I might even catch myself saying a little prayer in a particularly stressful moment, as an instinctive product of my childhood upbringing.
However, I think that the greatest likelihood is that the existing religions are complete nonsense, and that the ancient texts so revered by them are utter fairy tales. I also believe that prayer is pointless, and that a presidential call to prayer is primitive. So, being completely un-persuaded by any theism, I would consider myself atheist. Maybe it will turn out that I’m wrong and I will burn in hell as a result. I think that the likelihood of that is vanishingly small. But it is a possibility.