But you are redefining the name as well.
You are redefining God to mean "The universe".
We already have a name for the universe. That name is: "The Universe."
Deciding that "God" is a better name for it is not justifiable (at least as far as I can see) for two reasons.
First, you've provided no justification as to why calling it God is better than calling it The Universe.
Secondly, calling it God carries with it a lot of preconceived ideas, and these ideas will be different for different people. This creates a great deal of ambiguity as to what exactly you mean by calling the universe "God."