Christian conservative group the American Family Association (AFA) on Tuesday placed a full-page ad in The Washington Post calling on the Supreme Court not to strike down state bans on gay marriage.

The nation's highest court will hear arguments in a case challenging bans in Ohio, Kentucky, Michigan and Tennessee on April 28, with a ruling expected sometime in June.

The ad features a photo of Michelangelo's fresco painting The Creation of Adam from the Sistine Chapel along with the caption: “As you deliberate on marriage, remember whose idea it was in the first place.”

“Before you now is a great challenge: If your decision to resolve this matter forces same-sex marriage on America, you will have settled nothing,” the ad states. “We urge the Court to adjudicate rightly that which is God's alone to decide.”

AFA President Tim Wildmon appeared on Bryan Fischer's Focal Point radio show to discuss the ad.

“If the Supreme Court does this and foists unnatural quote marriage on all of America, it will be an incredible constitutional injustice,” he said. “It'll represent more of a power grab by the federal bench. And it'll be a fist in the face of God Almighty.”