We didn't so much "promote" the God billboards as simply answer the question posed (see QoD 10/26/2011), and we're equally happy to answer your question about "no God" billboards.
Of course, driving around the Las Vegas Valley, you're liable to encounter billboards advertising topless shows and nude clubs, machine gun shooting ranges, marijuana dispensaries (at least until recently), gay porn-movie recruitment ads, gratuitous cosmetic surgery come-ons, ambulance-chasing attorneys, bail bond companies, multiple all-you-can-eat-and-drink offers, and bacchanalian parties galore, not to mention all those mobile billboards advertising "strippers to your room." Collectively, our regular advertisers pretty much have the Seven Deadly Sins covered and the overall impression left by our ad signage might be enough to suggest to some visitors that there is no God, at least not in Las Vegas.
However, while that's not the point of those campaigns, obviously, there is an organization that has specifically hired billboard space to promote the message that "GOD IS A MYTH." Funded by the alien-worshiping UFO cult known as the North American Raëlism Movement, in February of this year the group purchased a prominent sign site on the I-15 southbound side to promote their belief that there is no God and that lifeforms on earth were created by advanced alien scientists known as the Elohim.
Apparently, in 1973 French race-car test driver and journalist Claude Vorilhon (now known as Raël) was visited by a being from another planet and told he'd been chosen by these aliens to be their messenger to humanity, following in the footsteps of past alleged Raëlian prophets, including Moses, Jesus, Muhammad, and the Buddha. While the movement claims to denounce all gods, and an official apostasy from other religions is required from new converts, the Raëlian "church" retains a quasi-clerical structure, with members starting out as "trainees" and moving up seven stages to the level of "Guide of Guides."
Sensuality and sexual liberalism are two of the tenets of the Raëlian movement, which is also heavily involved in attempts at human cloning and claimed in 2002 to have successfully cloned a human baby, although there's no proof of such. Adding to the controversy, which the Raëlians seem to court, in June of this year Raël named Louis Farrakhan, head of the Nation of Islam, as "Honorary Guide of Humanity."
Back in the summer of 2009 it was reported that Raël planned to open a "UFOland" attraction in Las Vegas, where visitors would be able to attend a Happiness Academy, see a full-size replica of a UFO, and be exposed to 35 years of accumulated evidence to prove that humans were created by advanced beings from another planet. Like so many other ambitious plans outlined for Las Vegas over the past few years, however, the Raëlism museum has not been heard of since, to our knowledge. We're pretty sure the sign has come down now, too.
"God is a Myth" image ©waltarrrrr.