Jesus is returning next month, according to one controversial group, and atheists are ready for it. They're throwing a "rapture party." While Christian radio broadcaster Harold Camping tries to warn the world that the rapture – where Christians will rise and join Jesus – will happen on May 21, the group American Atheists is calling it "nonsense" and advertising a party for "heathens and skeptics."

"The Rapture: You KNOW it's Nonsense. 2000 Years of 'Any Day Now,'" says the atheist group's billboard in Oakland, Calif. "Learn the Truth at our Rapture Party, May 21-22." The billboard is designed to mock "two millennia of false predictions that the world was about to end." Parties to celebrate "another rapture that wasn't" are scheduled for Houston, Fort Lauderdale and Oakland, where Camping's radio ministry is based.

The ad was erected in response to billboards that went up in recent months that say Jesus "is coming again" in May. Spearheaded by Camping's Family Radio, the ads direct the public to wecanknow.com where they are told that May 21 is the day that the rapture of believers will take place and October 21 is the day God will destroy the world.

Interestingly, atheists aren't the only ones rejecting the prediction. Christians have argued that predicting the date for the end of the world is unbiblical.  No one can know the day or the hour, they say, citing Scripture.

"The end of times is something that we all expect and hope for and look forward to but most Christians aren't in the business of trying to predict that date. They are working toward that date," Dr. Thomas B. Slater, professor of New Testament at Mercer University's McAfee School of Theology, told The Christian Post in an earlier interview.

Still, many evangelical Christians don't deny that the last days are near.