If you consider how much we don't know, the "creation story" just happens to be a very small fraction of that.
Religious people put a lot of weight on the creation story. It's not important. It's perhaps one of those things that people tend to wonder about, but in terms of scientific knowledge and the benefit of doing science to make the world better, figuring out exactly how the universe created is pretty much a useless undertaking.
The important fact is that the universe exists and has properties that can be understood through science. It is not even relevant whether it ever did not exist. It simply does, and for human purposes it always will.
The idea of the universe not existing is borrowed from religion. Scientists have come up with some fun theories, but there are a lot more useful/practical/interesting areas of science to think about than trying to come up with a scientific alternative to religious cosmogenesis myths.
That said, I also have faith (ironic, right?) that science will figure it out - they figured out gravity, calculus, relativity, etc. so why not this?
Not knowing why something happened is not enough for me to say "God exists." It means we need to keep looking for a reason.