"Is God Black Or White?" joke

A white man and a black man were arguing vehemently about whether God was black or white.
"God, is white!" insisted the white man.
"No way," replied the black man, "I'm sure God's black."
"I'll prove to you God is white," said the white man, "Come with me."
Both men, thereupon, made the long ascension to the top of Mt. Sinai.
The white man called out, "God, hear my prayer! Please tell us what color
you are!"
From the heavens came down a booming voice. "I AM WHAT I AM!" echoed all over the mountain.
"There, you see!" said the white man, "God, is definitely white!"
"Well, how do you know God is white from what he said?"
"Well," remarked the white man, quite impatient at this point, "If God were black he would have said `AH IS WHAT AH IS.'"