To get the full understanding of what he's driving at, you need to remember the previous excerpt. Basically, the gods are subject to a power greater than themselves and must manipulate that power via magic—just as humans try to do. So gods are just bigger versions of humanity, subject to circumstances outside themselves but with a bit more power and a longer (unending) life...that's what makes the biblical God so different and unique—he condemns magic because he doesn't need to control anything—he already does! And you can't control him via magic because he is creator of all...
Personally I find that refreshing and freeing : )