God does not come from anything or anyone. To ask "Where does
God come from?" is to imply that God has a source or a place from
which he came. If God is infinite then he is self-sustaining. He
has no beginning or end. He HAS no source he IS the source.
If you are asking, "Who made God?" it's an absurd question because
you are asking something like, "Who created the uncreated?" It's a
category mistake to ask who created the uncreated. It's like
asking, "Where is the bachelor's wife?"
God is not in the category of things that are created, or come into
existence, or are caused. God is uncaused and uncreated - He simply
exists.