I have been watching a series of lectures on Greek and Roman history.The lectures are informative and generally captivating. I find it interesting to get a better understanding of what life and society was like then (before Christianity - which had a HUGE influence on the world).
The segment that covered funerals had a neat tidbit: many Romans did not believe in an afterlife. A common epitaph (written on their tombstone) was:
"Non fui, fui, non sum, non curo"
"I didn't exist, then I existed, I don't exist now, and I don't give a damn"
It sounds like an atheist to me.