There has not been a church leader more outspoken than Rev. Franklin Graham about the US Supreme Court's decision on same-sex marriage, and now that the court has declared gay marriage a legal right, he is praying that "God will spare America from His judgment."

"The Supreme Court of the United States has ruled today that same-sex marriage is legal in all 50 states," he lamented on his Facebook page. "With all due respect to the court, it did not define marriage, and therefore is not entitled to re-define it."

Graham was referring to God's word found in the Bible, which truly defined marriage and was made "long before our government came into existence."

"Marriage was created by the One who created man and woman—Almighty God—and His decisions are not subject to review or revision by any man-made court," he explained.

Graham said God is clear about the definition of marriage, and he cited the Bible verse Genesis 2:24. It says, "Therefore a man shall leave his father and his mother and hold fast to his wife, and they shall become one flesh."

The evangelist is praying that God will show America some mercy even though "by our actions as a nation, we give Him less and less reason to do so."

During the Gay Pride event hosted in the White House, President Barack Obama said that "there has been an incredible shift in attitudes across the country." And Graham could not agree more.

"It is definitely not a shift for the good of America. The shift in attitudes he [Obama] refers to is the moral decline we are seeing manifest daily around us. Accepting wrong as right—accepting sin as something to be proud of. Yes, that's definitely a shift," he said.

Obama is leading America on a sinful course, warned Graham, and God will judge him and everybody else if they do not repent.