The whole "then who or what created God?" isn't used as a standalone argument to attempt to disprove God's existence. Hell, it's not even an argument to disprove God's existence. I've only ever seen it as a refutation to "Everything which exists has to have a creator," knowing full well that the Christian making this argument will use special pleading to claim that God always existed and doesn't need a creator.
Christian apologetics is the art of rolling a dog turd in sugar and selling it as a donut.
