Ok, it goes something like this. I haven’t looked at it in a while but I get the gist of it.
Premises:
1) Everything that exists in space and time has been created by something outside of itself.
2) The universe exists.
3) Therefore, the universe was created by something outside itself, namely God.
I’m not sure if these are the exact premises, like I said it’s been awhile since I looked over it. But one rebuttal to this argument is that the universe could just have existed eternally. This is a logically fallacy which I will demonstrate.
First, a question. Is it possible to reach the last “day” of and infinitely long time period? Of course not, then it would not be infinite. How about the second to last day? Nope, it would cease to be infinite because and infinite amount of days would have to have happened. How about the third to last day, or the fourth to last day? No again. Now you can see that in an infinitely long time, you can’t get to any certain day because an infinite amount of days would have had to happen before any given days or its infinity would cease to exist. But this is not true because today exists, therefore an infinite amount of days has not happened which means that the universe was created at some time. The question is by whom? That’s an easy one, God!
This might not be the correct way of stating this argument, but you get the idea. Hope this helps.