So lets tackle the easy one first. What did happen at the beginning, the Big Bang? Not what but who ( or whom?) God happened. He said “let there be…” And there was. It is the only explanation that makes sense. How else do you explain that from absolutely nothing, then BANG and there was everything. No force other than God can start with nothing and end up with everything, let alone ending up with anything. The best that anyone else can do is to start with something, add something and end up with something new. Art is the closest humans can come to creating but even then it’s only a new mixture of what was already there.
I’m not very good with math but check this 0+0=0. Always true right? In the beginning 0+0+Gods command(let there be light)=light. To end up with anything other than zero in the sum there has to more added to the equation.