Billboard battle over Judgment Day

(CNN) - We've told you about the caravan of RVs touring the country to warn people about the end of the world, which they say will begin on May 21.

Now, the American Atheists are mounting a counter-campaign.

The group has posted a billboard in Oakland, California - home to Family Radio, which is spreading the "awesome news" that Judgment Day is near - declaring that such messages are "nonsense."

"The Rapture: You KNOW it's Nonsense," the American Atheists' billboard announces. "2000 Years of 'Any Day Now.'"

The billboard - which cost $27,000, according to the group's website - invites passers-by to "Learn the Truth" at the group's "Rapture Party" on May 21-22 in Oakland.

The atheists also plan to hold parties in Houston, Texas, and Fort Lauderdale, Florida, the website says.

"This is how religion hurts people, one of the many ways religion hurts people," American Atheists President David Silverman told CNN Oakland, California, affiliate KGO.

"Our hope is that those who are not suckered in will learn from the people who are."

Read the full story at KGO's website.