True.
I wouldn't say it's that black and white. Again, this is another case of "If you're not A, then you must be B", because you've defined B as "Not A". I can see why you would, because of the term a-theist. However, it's a bit of a misnomer, as the word has evolved to mean a bit more than the simple combination of the prefix a- and the word 'theist'. It's not so much "Not theist", but rather "Anti-theist". It's meant to be the opposite of a theist, not simply a catch-all for anything that isn't a theist.
An atheist not only says they have no cause to believe in a deity, they refuse to consider the possibility of one. It's not worth trying to search for evidence or attempt to prove it. It's a pointless waste of resources. There is no god.
An agnostic "has no cause to believe", but also, no cause to explicitly disbelieve. Sure, any intelligent person will realize that, as Max has said, there are simpler, more elegant solutions to the mysteries of the universe than a deity. Many things that we couldn't explain before can now be explained easily without unknown, unmeasurable magical forces entering the picture. An agnostic will admit that based on the lack of evidence there is no reason to necessarily believe in a deity. However, they won't refute the possibility, and would not consider it a waste of time to gather more data on the subject. Science is always open to new data even on seemingly closed cases.
It's more about keeping an open mind than anything else. Consider if a new 21-24 NM is introduced to the game that, over the course of a year, has never dropped a single item. 'Atheists' may simply accept that it drops nothing and not bother with it anymore. They'll never kill it except out of extreme boredom or to piss off the 'theists' who still kill it daily. 'Agnostics', on the other hand, also accept that it may drop nothing yet also consider that it may just have a shitty drop rate and everyone's just been really unlucky. They may kill it on occasion if they see it up, but won't make it a daily LS activity like the 'theists', who are out there every day determined to be the first to get whatever it drops.
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