Firstly, humanity has tentative grasps as to why the universe exists and came in being, and further, just because we haven’t reached the level of science to explain it, doesn’t mean the explanation is “god”.
Do we? Like I said, I'm not religious so I don't believe in the usual conscious God who loves us because we're their special children.
But what I'm talking about of lies outside the bounds of science. Science is based on a kind of determinism that isn't really compatible with the concept of an origin to everything, an uncaused caused, an unmoved mover. If we found out what caused the universe to be in a hot dense state before the big bang, we would still have to keep asking what caused that previous thing.
Don't you think there's something inherently unfathomable about existence?
At the end. Same goes for anything that you generate with a tool like that