You don't have to believe in God to be moral, the ad says.

You don't have to believe in God to be moral, the ad says. (NEW YORK CITY ATHIESTS / June 27, 2009)

Two-dozen New York City buses will run ads aimed at boosting "atheist pride" among non-believers.

The 12-foot-long ads have a blue background and three-foot-high white letters that read "You don't have to believe in god to be a moral or ethical person."

Members of the NYC Atheists held a Saturday press conference in Manhattan's Columbus Circle to discuss the ads. They want to reassure non-believers that "it's OK to be an atheist."

The 30-day campaign was funded by an anonymous atheist.