We take atheism for granted today; the ancients took theism for granted.
Of course, that’s a sweeping generalisation. But the first part holds true for most university students today, and it has often led students to assume that the greatest ancient philosophers, politicians and authors were atheists at heart too. That is, until they find evidence to the contrary. The assumption – and I may be treading on some toes here – even pervades scholarship, particularly in studies on Roman religion, where well-respected scholars have treated Roman religion as little more than a convenient charade for the elite, a tool they cynically used to manipulate the masses.
But how prominent was atheism in Greek and Roman thought?