There is a lot of theoretical research going on to show how that is possible, some of it quite promising.
That is on of the unanswered questions of physics. But because it's unanswered doesn't mean that it can't be answered.
Everything that has a beginning needs to have begun. That doesn't imply the necessity of an intelligent creator ( i.e. God). The mechanism that sparked the creation of the universe has not yet been discovered, eventually it will be.
Forgive me but this strikes me as a "science-of-the-gap" argument - rather than question the paradigm you choose to place your trust i.e. faith that one day methodological naturalism will be able to explain it.
The beginning of the universe implies a Creator because the cause of the universe must be immaterial - an infinite regression of material causes is a logical impossibility.