Everything that exists has a creator, except God. This is because God, by definition, is uncreated and eternal.
When asked who created God, the response is that questioning the creator of something defined as uncreated is nonsensical, similar to asking if a child conceived by a man is a boy or girl. As conceiving children is a female attribute, it is illogical to attribute it to a male like the question does. Likewise, it does not make sense to ask about the creator of something defined as having no creator.
The existence of order and design in the universe is evidence that it was created by God, who as its creator would have knowledge of its workings revealed in the Quran