Dave,
Nark, are you asking if a person could KNOW there was no God, would that spark in him an interest in theology?
Yes, silly as it may seem (or be) that's what I meant.
Ancient mythology has been fascinating long after people had stopped believing in the actual existence of the gods. Actually it was all the more interesting from the moment it was not a living belief anymore. It became an enduring inspiration for philosophy, literature, etc. -- not to mention history of thought.
As long as a significant part of mankind actually believes in the monotheistic "God," this "God" is practically barred from such a fruitful cultural prospect. Each time an atheist refers metaphorically to "God" s/he is open to the misunderstanding of actual belief. And for this reason any philosophical or literary construction is impossible (at least on the public level), for it will end up in the sempiternal and vain discussion about the actual existence of "God".
I don't doubt that many current "believers" would lose interest in theology if such actual belief in "God" became impossible. But I think on the other hand philosophers and poets would quickly "resurrect" him.
The afterlife of gods is sometimes more interesting than their biography.