Concerning the creation of the universe, there are three basic possibilities:
1. Nothing became something (i.e. the universe) on its own
2. Something existed before and became something else
3. Something existed before and created something else
In the first scenario, we have an effect with no cause. It is impossible for nothing to become something on its own.
In the second scenario, we have something existing which becomes something else. That’s reasonable, but it offers no explanation as to how the first something came into existence.
In the third scenario, we have cause and effect—something created something. That happens all of the time. It is a possibility that is not only within reason, it’s the only intelligent scenario of the three.