"I don't understand how it would be desirable or sensible to define atheists apart from the spurious grounds of religion because atheists only exist because of it. If there was no such thing as theism, I wouldn't be an atheist, I wouldn't need to be."

Yep.

"I don't mind being called an atheist"

We have to put up with it for the sake of believers' convenience.

"or a non-believer."

Nah. Totally inaccurate characterisation. To be rejected.

"What I hate are atheists who turn atheism itself into what amounts to a religion."

Yes but I'm not sure I trust what you're calling a religion here. I haven't seen any examples of any atheists who act as though atheism is a religion. Beware of exasperated believers telling us that what we have is no less a religion than what they have. All we have is the simple requirement for evidence, not faith. That ain't complicated enough to be called a religion. Believers calling atheism a religion is wholly a manifestation of their insecurity. They can't bear not to define us on their terms at all times (as with the terms "atheist" and "non-believer").

"As an atheist, I'm not supposed to believe in a theistic or personal god and that is as far as it goes."

Nah. You're still caught in their silly trap. An atheist says to a believer that they have an interesting idea there, but I want to see evidence as I don't tend to rely on faith, thanks. I can't dismiss your idea for certain but I'm so confident that you're deluded that I can happily live my life in a state of complete disregard for it. Well, except for all those silly crosses and other icons that you insist on pushing in our faces at every opportunity, which are a bit hard to avoid.

"Any further than that, e.g. there is no continuance of consciousness after death, is beyond the bounds of atheism and has nothing to do with it since a god isn't required in this instance."

Just tell yourself what an honour it will be to return to stardust and you'll live a happy life. Thinking (without evidence of course) that there's consciousness after death, or reincarnation, or whatever other wacky ideas are currently fashionable, is falling into the religionists' trap of conceit. We just have to be so special that this can't possibly be all there is. It's the greatest human conceit of the lot, and it's the reason we have religion in the first place. Reject.   

"Hence, I do believe that atheists should be tested because many who call themselves that are not. They are radical materialists who don't know the first thing about atheist debate and have never cracked open a book on the subject."

It doesn't mean they're not atheists. Being an atheist isn't complicated and you really don't need to have read books about it (you hate atheists who try to turn it into a religion, remember? You seem to want it both ways). I'll tell you what. You set the test paper then.