I'm not a slave to a god, that doesn't exist.
I'm not a slave to a world that doesn't give a shit.

- Marilyn Manson

These words actually do make some sense, but there's always the everlasting question of does god exist. Can you believe in something you haven't got proof for?
It's not only about religion, there are examples in science as well. There are always some who are trying to prove quantum mechanics wrong. We simply choose to believe whatever theories seam reasonable and give the best fit of reality..