This 1854 map of world religion appeared as part of an atlas published in Scotland by cartographer Alexander Keith Johnston.

The map, a “Moral and Statistical Chart Showing the Geographical Distribution of Man According to Religious Belief”, presents religious geography from a Scotch Protestant perspective.

[R]eligious publications of the time often included figures tallying the relative prevalence of world religions, as a way of encouraging readers to fund and support mission efforts.

Via Slate.