Okay, how is this: I think the confusion about the "atheist belief system" thing still hinges on god either being real, or not, to the respective person's POV. So if they are real in your eyes, then atheists "have to have a system" because "god" is still the common thread that ties them together, they are just "against god". If you recognize there are no gods, then you have no belief system, because there is "nothing" there to tie you together. How can the absence of a thing tie you together if it's not there ?
When I tried out being a more cookie cutter believer for a time, I still hated going to a church. And whenever anyone would ask me if I was a believer, or start some conversation about such things .... if they were a believer, I would invariably get the "what church do you go to ?" question. When I told them "none" ... I got the look, the whole, "well .... why not ? Don't you need to be part of a body ? "
I realized this was the "pack" mentality to a degree. In their eyes, I was claiming to be a wolf, and wolves belong to a pack. Like them. A system, with a goal, whatever. And I was a "lone wolf" ... claiming to be out there on my own. In their eyes, at best, I was "one of those believers" .... one that thought I could get by on my own in the world without needing a pack to guide me, protect me, tell me what to do, please the Wolf God, etc. At worst, I wasn't even recognized as a believer ... I wasn't even considered a wolf at all. Completely shunned. Only True Wolves belonged to packs. Lone wolfs were something else, but not recognized by the believers.
I think that a believer views the atheist, at best, as a lone wolf .... at worst, a lone anti-wolf.
Now, when they see a group of lone wolves standing together, talking about things, joining together because of their lone wolfness or whatever you'd want to call it ... they see it as a pack. A system. And that pack must have a purpose.
What they have a hard time grasping, is that it's not a pack. Just because a bunch of lone wolves gathers together and share something in common, doesn't make them a pack, or the equivalent of a "church body", with a system of rules, and beliefs. It's not easily comprehended, because to them, you are still "wolves" and you are either forming a pack based on shunning packs, or you "really and truly deep down wish you were part of our pack,", etc and so forth.
Now, in that analogy, I think if you replace "wolf" with "werewolf" .... and atheist with "awerewolf" .... you are getting closer to what is really taking place. The believer thinks that werewolves are real, the atheist doesn't. So not only is there not a "werewolf" pack, with a werewolf system of lone werewolfs and grouped together werewolves .... there is no such thing as werewolves. Being labeled a nonwerewolf is redundant ... of course you aren't a werewolf, there are no such things as werewolves. How can you have a system of it ? At the very most, the system is a system of one simple thing: there are no werewolves. Stop.
So again, the believer is still basing their POV around the "fact" that gods are real. That hinge. And this is why they can't comprehend the "no need to go further" concept. Atheists are lone werewolves, or groups of packed together enemy werewolves. Even if an atheist wanted to get together a system of atheist beliefs, and this and that ... it can't even revolve around atheism. It would be misleading. Because it would involve having at it's core something that isn't even there.
For any who choose to respond, does this analogy work at all ?