God is not a name of a person, it is his identity. One of the meaning of God is that which is not created.
It looks like the child is considering the word ‘God’ to be someone’s name. ‘God’ is like an adjectif or title. Like President, or Teacher.
He is ‘God’ who was not Created.
He is ‘Teacher’ who instruct people about something.
He is ‘President’ who is the highest authority in government.
Then, who is God?
the Father is God, the Son is God, the Holy Spirit is God.
They are God, because they were not created. Only them were not created.