The typical atheist's historical knowledge as described by an atheist

It's a bit harsher of a description than I was expecting when I originally came across the article The Dark Age Myth: An Atheist Reviews “God’s Philosophers”:

One of the occupational hazards of being an atheist and secular humanist who hangs around on discussion boards is to encounter a staggering level of historical illiteracy. I like to console myself that many of the people on such boards have come to their atheism via the study of science and so, even if they are quite learned in things like geology and biology, usually have a grasp of history stunted at about high school level. I generally do this because the alternative is to admit that the average person's grasp of history and how history is studied is so utterly feeble as to be totally depressing.

Of course - this guy being an example - not all atheists / agnostics are like that. The guy has a few criticisms of the book though, in his words, they're "really quibbles"