Appearing Friday on Fox News, Franklin Graham warned that the Supreme Court's ruling striking down state bans on gay marriage will lead to the persecution of Christians and God's judgment on America.

Graham, the son of evangelist Billy Graham and head of the Billy Graham Evangelist Association, denounced the ruling, saying that “our government is recognizing sin.”

“I will never recognize it in my heart,” Graham told host Todd Starnes, because “God gave us marriage and God does not change his mind.”

“You better be ready and you better be prepared,” Graham warned Christians, “because it's coming. I think there will be persecution of Christians for our stand.”

“Our nation has a spiritual problem. And we need God's forgiveness. We need to repent of our sins and turn from our sins, because I do believe God's judgment will come on this nation. When we read in the Scripture, we see how God judged Israel. … And I believe God could bring judgment on America.”