This is a question which puzzled me as a child and still puzzles so many people today- ‘Who created God?’.
We know and this is a generally accepted fact in science that the universe had a beginning at the Big Bang. Therefore, if the universe-all of space, matter and time, had a beginning it must have had a cause that is spaceless, timeless and immaterial. Now if you are timeless do you have a beginning? That aside, knowing who made God is not required to know he created the universe. It is like saying that you can never know I created/typed this article , because you first have to know who created me. Or like saying that we can’t know Shakespeare created Hamlet, because we first have to know who created Shakespeare. Even if we might not know who made Shakespeare, we know he created hamlet.
I also explain a bit more in this video