Our definitions of exist are different.
Let's work that first.
I have said many times : If I name something, for example "Spaghetti pants that walk around everywhere", does it exist?
I define Spaghetti pants as pants made out of spaghetti, with the ability to walk.
I defined it, and named it, how does it possibly exist now?
For me (and dictionaries, various) existance occurs in time and space. If something exists, it participates and is located in time and space. Now God exists, but only as a concept in your mind, since concepts are physically caused by the brain functions, not something that made everything.