Rambam- What is G-D and Creation-Yisodei Hatorah the first Halacha

In the beginning of the Rambam's historical work, The Mishna Torah, he talks about the most fundamental of all things, what is G-D and Creation. The Rambam says,
יסוד היסודות ועמוד החכמות לידע שיש שם מצוי ראשון. והוא ממציא כל נמצא. וכל הנמצאים משמים וארץ ומה שביניהם לא נמצאו אלא מאמתת המצאו:
 "The base of all things and the pillar of all wisdom is to know that there is an original being and He is the cause of all beings. All of the beings that exist in the heavens, on earth and in between can not exist except through the truth of His existance."

Reflecting on the Rambam's opening words can give us a little insight into what the physical world really is and its point according to the Rambam. He assumes that all knowledge must first stem from the idea that G-D exists, without this there is no other thoughts possible and no other theories that can be made. The fact is that although people can explain most things in our universe one thing remains elusive, where did the original atom come from to create everything. Even the big bang theorists admit that there must have originally been molecules that could collide in order for the big bang to occur. So the physical world must be something that is a creation from a supreme being. As the physical world is a creation there must be a purpose and a use for it. Also, the fact that the physical world only exists through the truth of G-D then it must be that the purpose of the physical world relates to G-D and its use must be for the service of G-D.

I would venture to say that the reason the Rambam opens his book in this fashion is because he wants to differentiate himself from the secular philosophers, christian thinkers and ancient teachers. To see these other views see wikipedia's conceptions of G-D. However, he also just wants to point out the basis for all of his opinions in the philisophical world and the idea that it is futile to argue with him unless you also believe in these basic concepts.