The atheists eat babies meme is a dark humor meme used to illustrate the fact that many people distrust atheists and equate atheism with immorality (see: Distrust of atheists and Atheism and morality). There have been several studies indicating that many people have a low opinion of atheists (see: Views on atheists).
However, as can be seen below, China which has the largest atheist population in the world and state atheism, has citizens who are eating powdered human baby flesh because they believe it increases a person's stamina, increases sexual health and is also seen as a medicinal 'cure-all'. (see:Communist China and baby eating).
See also: Atheism and cannibalism
The Debunking Atheists blog states: "An atheist may... say murder, rape, and eating babies are wrong; but when asked why, they will not have a final reason, or authority, to which they can appeal to, besides their own subjectivity... So it is merely a personal choice not to." See: Atheism and morality and Atheist population and immorality and Objective morality