PY: Not so simple.
Using the “sharpshooter’s fallacy” Wolf pointed out before, any changes in universal constants would have created a much different world than we have, if it would even have been possible to create life. Athiests will say the constants are random.
None the less, an athiest still needs to agree that those constants (whatever they may be) exist somehow without intervention of a being (which would be a god-like power which then is anti-athiest).
So an Athiest has to start even before the “ball of mud”, with how did the rules (whatever they may have been) come into existence?
Now, there is multiverse theory (idea?), but talk about completely unprovable! And that in of itself points to complexity, which points to a creator.