Kirk Cameron has been slammed for his controversial anti-gay rant--calling homosexuality detrimental and destructive on CNN-- but Piers Morgan has stepped up to his defense saying the comments were honestly what Cameron believed.

The 41-year-old childhood actor was asked on CNN's Piers Morgan Tonight show if he thought homosexuality was a sin.

I think that it's unnatural, Cameron said. 'I think that it's detrimental, and ultimately destructive to so many of the foundations of civilization.'

The Gay and Lesbian Alliance against Defamation (GLAAD) has slammed the comments saying the evangelist and actor was out of step with the way he referred to homosexuality as unnatural.

Cameron, who launched his career in the 1980's sitcom Growing Pains, also took the opportunity to tell Piers Morgan about his opinion on marriage.

Marriage is almost as old as dirt, and it was defined in the garden between Adam and Eve, he said. 'One man, one woman for life 'til 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 also issued a statement denouncing Cameron's comments about gay marriage. 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, Herndon Graddick, Senior Director of Programs at GLAAD said.

In Cameron's defense, Piers Morgan said, Cameron stuck to his own moral code and was honest to what he believed. He admitted that many people would find Cameron's views antiquated.

A petition has been launched against Cameron by Glaad: Words and Images Matter. Over 2000 people have signed it, telling the actor it's time to finally grow up.

Cameron may have joined Victoria Jackson and Chuck Norris in public anti-homosexuality rhetoric, but there are many high profile actors and celebrities who are in the public eye for advocating gay rights.

On Saturday, Brad Pitt and George Clooney joined a star-studded cast in a play 8, which examined the overturning of the controversial Proposition 8 law in California.

Pitt joined George Clooney and Dustin Lance Black, in a one-night reading of the play that took place at the Wilshire Ebell Theatre on Saturday.

The Oscar-nominated actor played the part of U.S. District Chief Judge, Vaughn R. Walker, who overturned California's gay-marriage ban in 2010, after ruling that Proposition 8 was unconstitutional.

In 2008, Pitt told Esquire Magazine that he would not be marrying Angelina Jolie until restrictions on who can marry are dropped.