> God cannot be both omnipresent and only exist outside of time.
How so? God exists simultaneously at all the moments that exist. Time was created by God, just like the universe was.
> so clearly that God at least exists within the temporal universe.
Imagine you are writing a book, where you, as the author, are also a character. You can interact with your characters as they do things - but you can also go back and change anything you want, and you can see the ending as well.
(Keep in mind that God always maintains free will - God doesn't force any human to act in any particular way, it's always their own choice.)
