(RNS) — If today’s high schoolers don’t know John Green from his bestselling young adult novels, like “The Fault in Our Stars” or “Looking for Alaska,” they might recognize him as the host of that ...

Atheism is far from new, but the various ways that people say “no thank you” to belief in gods, deities, or particular religions are so diverse that they’ve had a huge impact on world belief systems.

Religious leaders play a big role in shaping religions today. But who speaks for a religion? From priests to imams, from rabbis to gurus, religious leaders play a big role in shaping religions today.