Humans do lots of peculiar things (think: hot dog eating contests, parliaments). But religion stands out as truly exceptional. I argue that religion isn’t so much *an evolutionary puzzle* that we need to solve, it’s 2 intertwined puzzles. I call them The Puzzle of Faith and the Puzzle of Atheism.

The Puzzle of Faith is about the simultaneous uniqueness and ubiquity of religion – how we became the only religious species. What are the cultural and evolutionary pressures that have most members of our species, and no members of other species, worshipping their gods? Why religion and why us?