Viviane, your logic is indisputable, but I didn't suggest that the complexity of "creator+universe" could be less than just "universe" -- only equal to it, or maybe just a bit more than it (conceivably within an order of magnitude, e.g. creator+universe only being 2x or 4x as complex as the universe alone).
And to recap, Occam's Razor is not a law of nature, so even if the creator makes the picture 10x as complex, this is not necessarily meaningful in estimating probability. After all, complexity is not the sole indicator of probability.
It could be that the formation of a creator according to the laws of a different universe was much more likely than the formation of intelligent life on earth; a number of non-religious scientists have stated that our own evolution could be an extreme fluke event.
We can also see lots of examples in nature where evolution chose to do things in a more complicated way than is necessary, when its "creations" are looked at as finished products. The more complex approach that nature used only makes sense to us once we understand the steps it followed to get there.