So if I was an atheist (again I'm not) and I came to you and gave you a set time to prove God's existence over all the insurmountable proof against God's existence, what would you say or point me to?
I would show you some astounding things from the Bible to help you see that something superior had a hand in it. If you allowed, I would ask if you remember when scientists and the general world discovered the earth was circular rather than flat. Perhaps you remember the jingle we learned in School about Columbus sailed the ocean blue, in 1492? Most do recall that people believed and told him that he would fall off the edge, yet discovered that the ship slowly disappeared as if it were sinking, which would indicating it was going down hill, which all water does, at any given point on water, you are on the top, the highest point. If something moves away from you it will appear to descend.
Next I would take you to Isa 40:22 which was penned around the year 730 BCE. It says:
(Isaiah 40:22) . . .There is One who dwells above the circle of the earth,. . .
Then I would take you to something that Moses said and ask how he could possibly know this: (Job 26:7) . . .He stretches out the northern sky over empty space, Suspending the earth upon nothing; That was written a little after 1500 BCE. That should put some questions in your mind as to how they could have possibly known that when the brightest of scientific minds didn't.
If your interest was aroused, I would set up a time to next look at some other Bible prophecies that came true.