That was always a myth based upon the fact that he once called God "the chief commander" in the 60 Minutes interview. Not a real thing.
But, he refers to a bargain made with "it" "of this world and the world we can't see" and he did it in a Robert Johnson at the crossroads-esque way for talent and fame. I didn't think God was into bargaining with Atheists to give them fame and magical scribbling powers, but I could be wrong.
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