The radiation left over from the Big Bang is the same as that in your microwave oven but very much less powerful. It would heat your pizza only to minus 271.3*C - not much good for defrosting the pizza let alone cooking it.
If God had sufficient wisdom and power to construct such a beautiful world as this then we must admit that his wisdom and power are immeasurably greater than that of man and hence he is qualified to reign as king.