The 5th dimension is surrounded by an infinite number of universes of infinite size. The higher dimensions are "wrapped up" - they probably do nothing more than define the sizes of the hadrons and various quantum manifestations.
We live in one of the universes. It seems to have banged into another universe at some point. This created heat, and with it hadrons. 90% of our gravitational background derives from universes outside our own. They are much hotter. Kind of like our classically intuited image of "hell" - more like the Buddhist "hell" than the Zorastrian "hell".
Now, where is God? Is He inside our universe, or outside it. Is he astride the 5th dimension? How does he communicate with critters on the inside of one of the infinitude of infinite timeless universes that border the 5th dimension?
What should your typical atheist make of this situation where the "hardware" that used to be assigned solely to the invisible world of God is now something subject to the analysis of mathematicians and the examination of physicists? Remember, the atheists said the "hardware" didn't exist either, and there was nothing beyond the first three dimensions, with an ending and beginning of the 4th dependent solely on an ever regurgitating "big bang".
St. John noted that even the devils in hell know that God exists. So, once we can define and examine hell, and maybe even start communication with one of its residents, will the atheists continue to deny the Creator?
We'll all find out, eh?!