Science does not claim to have the answers in the way that religion does - but science, by definition, continues to question and learn, not simply 'decide' and stop there.
For example, for generations, scientists pondered how a bumble bee was able to fly, since analysis of its wing dimensions measured against its body weight meant that its flight defied the proven laws of aerodynamics. Fortunately, no-one advised the bee that its flight was actually impossible.
Eventually, developments in photography proved that it was not the science or the laws that were wrong, simply the assumption that a bee operated its wings like all other flying insects, which of course it does not. It's ability to rotate its wings in flight is what enables it to fly.
There we have a perfect example of the questioning of science debunking a fact which on the face of it was believed to be true for hundreds of years, even though evidence to the contrary flew around the scientists' gardens every summer.
On that basis, there will come a time when science will explain the origin of the universe, but in the mean time, Christians will have maintained their dogmatic assertion that it 'must be God', and will have perpetuated it from this day to that - because that is how Christians operate - they just 'know'.