The complexity of our Brains is what gives us the Intelligence we have. We are also not the only animal that has Intelligence, ours is just the most developed.
You are making the mistake of Assuming only Intelligence can give Intelligence. A common Creationist mistake.
If it's such a "creationist mistake", please explain:
How can we, then, get inteliigence from a process that's absent of it? This is basically the crux of my inquiry, gentlemen.