The Rapture is one of the biggest irrationalities ever. Even if one believed in God and religion, why would they believe that there is an arbitrary date for the world to end. Why would they believe the Mayans knew (in an entirely different calendar), that it was going to happen next December?
I think it's so irrational that I decided to write a comic about it called Katrina Hates Dead S%&, which you can find on the site www.katrinacomic.com
I think you guys will enjoy it.