Atheists like asking Muslims and other theists who created God (الله). The obvious answer though is None.

God (الله) by definition is the Ever-living and Sustainer of all that exist. That means God (الله) is the only creator and is uncreated.

SAHIH International –
3:2 Allah – there is no deity except Him, the Ever-Living, the Sustainer of existence.
Arabic: اللَّهُ لَا إِلَٰهَ إِلَّا هُوَ الْحَيُّ الْقَيُّومُ

Note: The word “him” is being used in the general sense. God (الله) has no gender or sex.