So, logically, then, when you reject the conceptual images and ideals that religious theists dress the Great Mystery of Being up in, that's actually all you're doing ... rejecting the 'artifice'. Not the actual content that the artifice is being used to 'embody', and represent.
I do not believe the artifice (if you like) Zues, Jehovah, and Yemaya exists.
Some Pagans, Christians, believe Zues, Jehovah, Odin, whoever, does exist; not as an artifice but an actual being or entity. I reject
that claim "because" I don't believe they exist.
As for the mystery (not great, or anything like that), I do believe life is a mystery. Asking what it is, our place, etc are human question not "godly" ones.
Edit.
I don't reject that life is a mystery and that we do not know everything there is to know about life (and do not need to know). I choose not to reject it. I'm indifferent to it.
It's not "Great" in my perspective. I don't make it a god.
I don't see a problem with rejecting either the artifice and/or the content.
I don't see the need to call the mystery of life great-calling and describing it as great is itself putting an artifice to the mystery. It just is.
I.e., "jousting at windmills" because someone else imagines them to be "dragons". This is what a lot of "atheism" seem to essentially be about, IMO.
No. Atheism isn't about that any more than all theists believe gods need have artifices. Some just stick to the content and let it be.
Maybe you mean some atheists. Many atheists do reject the artifice because they are told that the artifice is the content not represents it. So, from Their point of view not yours, they do reject the content "because" they believe it does not exists (which makes them an atheist).
Rejection of content makes one an anti-theist
Not believing the content exists makes one an atheist
Some people who do not believe in the content's existence (atheist) are anti-theist (reject the content). Some people who reject the content (anti-theist) may still believe the content exists (theist). Some people who do not believe the content exist (athiest) are indifferent to it (does not care). Some people who believe the content exists (theist) can be indifferent to it-indifferent does not mean rejection.
The key here is many atheists are told by society and indoctrinated to believe that the artifice IS the content. So, you cannot judge your definition of god and accuse them of rejecting because they do not believe and relate to how you describe god in order to reject it none less claim it doesn't exist.
If you don't try to understand how they see the artifice as the content, you'd forever be "arguing with yourself" because they just don't fit your definition of god to have any opinions and rejection to it.