One of the questions people sometimes pose to theists goes like this: If God created everything then what created God? The questioner is sometimes trying to force the theist into admitting an infinite regress of Creators and thereby illustrate the absurdity of saying that God created everything - to wit, if A is created by B then what created B? Was it C? If so, what created C? Was it D? etc. ad infinitum.
This line of questioning, however, betrays a fundamental misunderstanding of the difference between contingent and necessary being as well as a misunderstanding of the nature of God.
The nine-minute video below explains why the questions are based on a confusion and also explains the theological doctrine of aseity. If you're interested in philosophical theology you'll want to give it a look:
