Franklin Graham, the son of evangelist Billy Graham, on Thursday condemned President Barack Obama's endorsement of gay marriage.

Graham, who backed Tuesday's passage of Amendment One, North Carolina's gay marriage ban, said the president has “shaken his fist” at God.

In making his endorsement, Obama cited his faith, telling ABC News that he and the First Lady “are both practicing Christians and obviously this position may be considered to put us at odds with the views of others but, you know, when we think about our faith, the thing at root that we think about is, not only Christ sacrificing himself on our behalf, but it's also the Golden Rule, you know, treat others the way you would want to be treated.”

In chiding the president, Graham said marriage “is 8,000 years old and was defined not by man, but by God Himself.”

“In changing his position from that of Senator/candidate Obama, President Obama has, in my view, shaken his fist at the same God who created and defined marriage. It grieves me that our president would now affirm same-sex marriage, though I believe it grieves God even more.”

Graham added that “changing legislation or policy will never change God's definition” and “This is a sad day for America.”

Billy Graham, 93, also called on North Carolinians to approve Amendment One.