Does putting theism into an atheist context make for a meaningful comparison? What are you going to do with this information?
I don't think comparison of atheism and theism in that way is particularly meaningful. However I still think it's worth keeping this concept in mind. To explain;
Atheists and theists commonly talk past each other.
I'm going to completely generalise here, in the interests of making my point, but atheists are often talking about evidence, proof, scientific verification. This underpins their atheism. Theists are often talking about looking beyond the limits of our 5 senses. About the supernatural. About a higher purpose.
It's selfish, but something that theists should keep in mind is that they don't accept ALL God concepts of the world. Commonly, they don't even exist MANY God concepts of the world. Instead, they are selecting one. Which means they are rejecting others (at least effectively).
Whilst I think the 'Atheists have just gone one God further' line is unlikely to convince any theists of anything much, and can sound trite, it might make sense to them that moving through a series of God concepts and not finding one that seems the truth is really all atheism is.
Ergo, I've been exposed to some of the multitude of religions and God concepts in the world. Of those I have been exposed to, I've found none neccessary or compelling. Therefore I'm an atheist.
Maybe a slightly different slant on the same tired old arguments?