You don't seem to be able to grasp that the word "exists" requires the passage of time. Whatever exists has persistence - before moments followed by after moments. It might have always existed or have had a first moment, and it might be eternal or have a last moment. Either way, to exist is to persist in time.<quoted text>
God exist in a dimension you can't imagine. So it would be impossible to guess how God who is outside of time always existed. You can't even grasp what outside of time would be like even though we pretty much know it exist.
Your god has to exist in time to do things and think things, such as decide to create a universe, to do it, then to look at it, and finally to say that it was good. Those words all imply time - before, during and after moments experienced sequentially.
It not hard to dissect Christian doctrine and reveal its inconsistencies and contradictions with a little analysis.