ANAHEIM (CBS) — A local group of self-professed atheists in Orange County have launched a provocative ad campaign that challenges the Bible and questions the existence of God.

Backyard Skeptics debuted the campaign on Friday at an Anaheim bus stop with an ad depicted a picture of the Bible with the group’s slogan underneath reading, “Have doubts? So do we.”

A spokesman told the Orange County Register the $8,000 effort is aimed at letting “nonbelievers know there is a community of non-theists who share the idea that we can be good without God.”

The group, which claims membership ranks numbering over 400, wants to “encourage others to look at their world view with critical thinking skills so they too can feel they can be good without God,” according to their website.

As many as thirty bus-shelter ads are slated to go up in neighboring cities, including Costa Mesa, Huntington Beach, Irvine, Laguna Niguel, Laguna Woods, Mission Viejo and Newport Beach.