Religion is often characterized as a human universal – researchers claim that nearly every society boasts some form of religious belief. But it’s also no secret that individual people often vary dramatically in their levels of religious belief. You might be a Bible-believing Christian, while your neighbor – who speaks the same language, eats at the same pizzeria, and enjoys the same movies – is a dyed-in-the-wool atheist. So where do these religious differences come from? A new research paper claims that the answer might lie in people’s ability – or lack thereof – to imagine the mental states of others.