Since 'eternal' is a temporal expression, why do you use it in your argument? ... The term 'ex nihilo' should be taken to mean 'without reliance upon' and we are offering to you that dimensions like Time and Space would be something your notion of god would need in order to create. You are arguing in a circular fashion, assuming that which is the actual essence of the debate, that before Time and before Space, is I AM, and I AM does not need pre-existing conditions, God authors the conditions, God authors the information which then uses the conditions to create.
When you jump into a circle, in effect stating 'before ex-nihilo', your perspective cannot come to any other conclusion than what you've built into it by starting from a false premise.