Nearly 30 would be "nones" — an amorphous group that spans from zealous atheists to the vaguely spiritual.

When Jesus was crucified, it led to even more followers. When books are banned, people flock to read them. Humans are fascinated by the forbidden, which is why censorship – especially in the digital age – doesn’t work. Jacob Mchangama explains.

Humans have always had religion. What does this say about our minds? Reza Aslan PhD, Lisa Miller PhD, and Rob Bell MDiv explain.