It depends on what god is and its nature. I was never raised with knowing what a god is; so, to use it as a concept (outside of what I learned on RF) would be near to impossible.
In order to make sense of this question, I would have to have some idea what you're speaking of. Since this is a question you've asked, I'd assume you'd know more of what you're asking than I would.
Many atheist on RF had christian experiences where upbringing or otherwise. So, like christians, it's easier (in my opinion) to speak of god the way christians do. If you're speaking to someone who does not have that background (there are many surprisingly), they'd look at christians and atheist funny wondering what in the world are they talking about.
@Subduction Zone
See post #57