And yet it is a belief: the atheist simply has no idea whether a so-called creator exists or not, so he believes he doesn’t exist.
The religious person also has no idea whether a so-called creator exists or not, but he believes he does exist.
The belief is the common factor, only the object of belief is different.
You see, the atheist doesn’t say ‘ I don’t know’, which is the only fact both of them ‘have’. But neither stick to that fact and both enter the realm of belief.

Are you sure ponz?
You see, it’s the opposite side of the same coin. Which is belief.
A religious person says ‘ I believe that God exists.’
An atheist says: ‘ I believe that God does not exist.’
They both believe, they both don’t know, they both have doubts. Same difference. In fact the same amount of doubt is countered by the same amount of ‘faith’, or counter-doubt. It appears differently only because the conscious and the unconscious percentages vary from person to person—one may exhibit 31% doubt and 69% ‘faith’, consciously, while unconsciously it’s the opposite. The bottom line percentage is always 50-50, just like desire, which always has a counter-desire, if one observes the human psyche closely.
Now, the atheist is simply not aware of his doubts, of his beliefs, of his projections. But in the middle of an acute crisis, the atheist will also invoke a superhuman factor, a creator, someone who has the power to change a sad (for him) destiny. Just watch an atheist in times of crises, or watch yourself if you are one. Even when the prayer to such an entity is repressed, it only indicates the hidden belief in the superstitious factor.
The reason is simple: both the religious and the atheist are not free of fear, of the illusion which produces fear, insecurity and so they both project the same supernatural image, in essence.
Atheism is a lack of belief in god not a belief in that god doesn't exists.