Oddly, Ockham himself "did not hesitate to declare that God could create other worlds similar to ours," http://www.newadvent.org/cathen/12047a.htm which implied God created ours.
Creation Ministries says this: "However, by invoking Occam’s Razor, sceptics make a rod for their own backs for, as we shall see, once the validity of Occam’s Razor is admitted and this criterion is applied to aspects of the creation/evolution debate, the results are clearly on the side of creation and against evolution." http://creation.com/occam-s-razor-and-creation/evolution
However:
"Among its practical applications, Occam's Razor has been used by atheists to argue against the existence of God.[1] Let us take for an example the origin of intelligent life on Earth. One possibility for intelligent life is naturalistic evolution via natural selection. A second possibility is that God used evolution as His means of creation. Occam's Razor allows us to eliminate God from the hypothesis, since the idea is an unnecessary additional assumption. The 'simpler' explanation (that which makes fewer fundamental assumptions) is that God had nothing to do with the development of Intelligent Life and that it came about as a result of natural processes. Therefore, the earlier explanation is the most reasonable to believe.
It is, however, important to note that Ockham himself did not accept this reasoning; indeed, he considered the existence of God and the authority of Scripture to be truths which trumped the principle. While Occam's Razor is frequently articulated as "The simplest explanation is to be preferred," what he actually said was "For nothing ought to be posited without a reason given, unless it is self-evident (literally, known through itself) or known by experience or proved by the authority of Sacred Scripture." [2] " http://www.conservapedia.com/Occam's_Razor
THEREFORE: Occam's Razor as we COMMONLY know it disproves creation; but as Occam actually stated it (see above) it does NOT disprove Creation.
Occam did not believe in "something from nothing," since the Catholic Encyclopedia (link above) proves he believed in Creation.