DENVER -- We first told you about them last week and now they're here.

Eleven billboards in have gone up in metro Denver and Colorado Springs that question the existence of God.

The first one went up at E. Colfax Avenue and Quebec Street in Denver. It says, "Don't believe in God? You are not alone." The two lines sit against a blue sky backdrop.

The billboards cost $5,000 total and will be up until mid-December.

The group that started the campaign is called the Colorado Coalition of Reason or COCORE. COCORE said the billboards are not meant to offend Christians, but rather to create a more cohesive secular community of non-believers and free-thinkers.

"It simply reaches out to people who have no belief in God and are feeling isolated by the religious world around them," said Marvin Straus, co-founder of the Boulder Atheists.

"I've had feedback from people who thought it denigrated Christians. Totally untrue. It doesn't talk about Christians, or Muslims, or Hindus or any religion. It's specifically addressed to the non-believer."

The original story generated a storm of online comments.

"America had tremendous Christian influence in our founding. And we have been an example to the world of religious tolerance," said Bob Enyart, spokesman for American Right to Life. "The awesome complexity of biological life, DNA, the genetic code... you need a cell and a nucleus that have this genetic functionality. It's wildly complex. More than a 747. And the idea that it would come about by chance and natural selection is not tenable. We have a Creator," said Enyart.

Joel Guttormson, the president of the Metro State Atheists, said the billboard should be viewed as nothing more than a message to non-believers.

"We don't even mention Christianity on the billboard," said Guttormson. "I would like to know what they're offended by. It's not even targeted to them. For instance, if there's a billboard talking about Migraines and it says, "Have a Migraine? Try Aspirin." Or something to that effect. People who don't have Migraines shouldn't be offended."

"I don't hear this controversy about crosses going up. I don't see why we have to take this kind of heat," said Guttormson.

"Believe it or not, I do have contact with religious people and I find most of them to be extraordinarily nice. They do good things," said Staus. "I think that when we have people trying to force their religious views on others it's not the majority of the religious people in this country. That's the small, vocal, active minority."