IMO
I suggest you have set up a false dichotomy here. The first issue is that Atheism, however people erroneously portray it, is not a group belief, for it is not a belief in something. The term only exists in the presence of theistic belief systems. All atheism states is that of all the infinite number of things one considers not to exist or be real, entities described by theistic beliefs would be included in that set of imaginary things not believed in. There is no law, written or unwritten regarding Atheism. It is simply a default class to place anyone who does not hold to any of the untold number of religious belief systems.
Conversely, the theistic position is an affirmative belief in a theistic entity, one of an untold number of such entities who are only classed together upon a small number of criteria, including that that are undetectable and not part of the physical world. In the theistic class, there is no single set of written or unwritten laws, but a whole host of laws specific to each untold number of religious belief systems.
Theists and Atheists are also opposites, with the POV of each, sort of against the law of the other. An atheist cannot accept God nor can a theist deny God or they will violate the unwritten laws of their group belief.
I suggest you have set up a false dichotomy here. The first issue is that Atheism, however people erroneously portray it, is not a group belief, for it is not a belief in something. The term only exists in the presence of theistic belief systems. All atheism states is that of all the infinite number of things one considers not to exist or be real, entities described by theistic beliefs would be included in that set of imaginary things not believed in. There is no law, written or unwritten regarding Atheism. It is simply a default class to place anyone who does not hold to any of the untold number of religious belief systems.
Conversely, the theistic position is an affirmative belief in a theistic entity, one of an untold number of such entities who are only classed together upon a small number of criteria, including that that are undetectable and not part of the physical world. In the theistic class, there is no single set of written or unwritten laws, but a whole host of laws specific to each untold number of religious belief systems.