Hal Holbrook mimicked Mark Twain of Hannibal, Missouri; Tovah Feldshuh did Golda Meir from Kiev and Milwaukee, Wisconsin; Julie Harris played Emily Dickinson from Amherst, Massachusetts. Now comes Jim Parsons perhaps responding to a Higher Calling, playing God from Grossinger’s, of Borscht Belt. I would add “Oy,” but that would raise the comic level of An Act Of God a notch or two.