A Snapshot of Data Recalls What is Missing

This article has an interesting map of where the world's atheists live. Two things stand out about the map. The huge areas that are grey, meaning that they were not surveyed. The second is some historical perspective, which the article tries to supply. It would be very interesting to see maps showing answers to the question at different time periods in the past. Alas, for now, we have the same information for then as we do for Brazil now.