And now: GLAAD vs. Kirk Cameron.

The Gay & Lesbian Alliance Against Defamation is taking on the 1980s sitcom actor for comments Cameron made to CNN’s Piers Morgan.

Morgan asked the former Growing Pains star and evangelical Christian if he thought homosexuality was a sin. “I think that it’s unnatural,” Cameron replied on Friday’s Piers Morgan Tonight. “I think that it’s detrimental, and ultimately destructive to so many of the foundations of civilization.”

Cameron was also asked about gay marriage:“I believe marriage was defined by God,” Cameron said. “Marriage is almost as old as dirt, and it was defined in the Garden between Adam and Eve. One man, one woman for life till death do you part. So I would never attempt to try to redefine marriage. And I don’t think anyone else should either. So do I support the idea of gay marriage? No, I don’t.”

GLAAD shot back: “In this interview, Kirk Cameron sounds even more dated than his 1980s TV character,” said Herndon Graddick, Senior Director of Programs at GLAAD. “Cameron is out of step with a growing majority of Americans … with an increasing number of states recognizing marriage equality, Americans are seeing that marriage is about committed couples who want to make a lifelong promise to take care of and be responsible for each other and that gay and lesbian couples need equal security and legal protections. That’s not ‘redefining’ anything.”

A GLAAD spokesperson told that its launching an online petition for fans to tell Cameron “he’s no longer your idol.” Though the organization has successfully convinced many celebrities to apologize for their comments about homosexuality over the years, one suspects Cameron isn’t going to back down from his beliefs anytime soon.

Here’s the key exchange from last night’s CNN interview: