Cardinal Francis George is being called on to resign in a full page ad for comparing gay rights activist to the Ku Klux Klan.

The ad to run Sunday in The Chicago Tribune is being paid for by gay rights group Truth Wins Out.

“Hey, Francis George, gay is not like the KKK,” the ad's headline states.

George, the head of the Catholic Conference of Illinois and the Archbishop of Chicago, is under fire for saying during a Fox Chicago interview that he believes a Gay Pride parade route in Chicago should be altered to avoid passing in front of Our Lady of Mount Carmel's front doors.

“I go with the pastor,” George said. “He's telling us that he won't be able to have services on Sunday if that's the case. You don't want the gay liberation movement morph into something like the Klu Klux Klan, demonstrating in the streets against Catholicism.”

George defended his stance when the host called it “a little strong.”

“It is, but you take a look at the rhetoric. The rhetoric of the Klu Klux Klan, the rhetoric of some of the gay liberation people. Who is the enemy? Who is the enemy? The Catholic Church.”

In an interview on Christmas Day, George softened his remarks.

“Obviously, it's absurd to say the gay and lesbian community are the Ku Klux Klan,” he told ABC 7. “But if you organize a parade that looks like parades that we've had in our past because it stops us from worshiping God, well then that's the comparison. But it's not with people and people – it's parade-parade.”

Wayne Besen, executive director of Truth Wins Out, said an apology would not suffice and that the archbishop needed to step down.

“We felt compelled to place this ad after Cardinal George compounded his initial smear with further insults disguised as an apology. It seems the sin of pride is keeping George from saying he is sorry. At this point, the only road to redemption is his resignation,” Besen said in a statement.