Peter LaBarbera of Americans For Truth About Homosexuality was not happy last month when Chick-Fil-A CEO Dan Cathy said he was going to stop speaking out publicly against marriage equality, calling him a “sellout” who was “hurting the cause.”

The anti-gay activist was even further dispirited by the charity World Vision’s decision – since reversed – to recognize the marriages of its gay employees. Speaking with talk show host Janet Mefferd yesterday, LaBarbera told evangelicals that you can’t “call yourself a Christian” and also support “redefining marriage to accommodate a sexual sin.”

When Mefferd asked him whether he thought controversies like the one over World Vision’s treatment of gay employees would become more common, LaBarbera responded, “Yeah, I think a lot of evangelicals are going to sell out.”

“I’m afraid were going to see evangelicals either opting out of this issue entirely…or, even worse than that, we’re going to see evangelicals getting behind the idea of natural gay identity and even so-called homosexual marriage,” he said.

“And that’s a sad thing,” he continued, “because if you’re going to call yourself a Christian, don’t get behind non-Christian or anti-Christian ideas. Struggling with homosexuality is one thing – many people struggle with sins – but proudly defending homosexuality and even redefining marriage to accommodate a sexual sin is quite another.”