no God? yeah right!

Why do atheist groups dedicate so much effort telling people (believers and not) that we (believers) are wrong? Everyday Christian (http://www.everydaychristian.com/) just posted an article about a new advert campaign by American Humanist Association (http://www.considerhumanism.org/) to discredit the Bible.

Atheist Group Launching National Ad Campaign Challenging Bible
http://www.everydaychristian.com/news/weblink/8887/

These groups of non-believers spend lots more effort telling people that there's no God than we (Christians) spend teaching about God. Maybe it's the sickening desperation of proving themselves that their belief system must be true, yet doubting their own belief system.