This infographic takes data from The Pew Forum on Religion and Public Life, Adherents.com and Wikipedia to classify the world’s population into religious groups. I think it’s quite hard to collect reliable information about this, and find it wrong to put secular people within the same group as atheists, irreligious and agnostics, as many religious people may also be secular. Anyway, it’s really interesting to have a look at it for further discussion or research.
Source: National Post
Credit: Robert Johnson