No He is not. G-D isn't a person to be a Jew or not a Jew. Their is no image of G-D etc.
Maybe I can put it into better perspective.. Of course Gd is not a person..
Maybe more accurate to say, Gd is the biggest Zionist there ever is. However, He did give the Jewish people divine law and divine truth directly. He wrote the written and oral Torah. So wouldn't that make Him the biggest Jew there ever Is?