Today, virtually all scientists agree that the universe has an origin. That means there was a time (although time did not exist yet…more about that later!) when the universe did not exist, and then in an instant, it did.
Scientific evidence (and common sense) tells us that everything that begins to exist must have a cause. The universe had a beginning. Therefore, it must have a cause.
Nothing has ever spontaneously sprung into existence out of nothing. If we accept that the universe had a start, we must accept that something started, caused, or created it.