Atheists? As someone said, we don't have a special word for people who don't believe in Santa Claus or the tooth fairy, so why a special word for people who don't swallow some other fairy tale?

But as for methods, it must be time to quote one of my favourite poets:

Razors pain you;
Rivers are damp;
Acids stain you;
And drugs cause cramp.
Guns aren't lawful;
Nooses give;
Gas smells awful;
You might as well live.