The Creator is greater than His creation. God must exist to create! Nothing can just happen without cause all by itself. Even science knows something existed. Because He’s eternal from everlasting to everlasting, the Father of time or time/space just doesn't exist apart from the material world of matter/energy. No one knows what the concept of time really is but God is not confined, defined, nor limited by it.
He can see the future as the present all in one moment because of this. God is immaterial and therefore doesn't need space or time as He is not part of the time-space continuum. God is spirit and that means immaterial and not having any physical limits; therefore, not time or space dimensions (God is ultra-dimensional and can enter any dimension He chooses; I AM WHO I AM WHO I AM ….. He decides the terms of His existence which are infinite and incomprehensible to us: the finite cannot grasp the infinite by definition; this can also be interpreted as I CAUSE TO BE.... (God as the First Cause or Uncaused Cause).
Even science knows that time (the energy clock) began at creation (the Big Bang) and that something or someone must have “existed” before that due to the law of cause and effect; everything that begins to exist has a cause—the universe began and therefore was caused and most likely by God. For nothing can cause or create itself. Soli Deo Gloria!