Since God created the universe then God existed before the universe. We know scientifically that there are other dimensions, we exist in a universe of 3 to 4 dimensions if you include time. But there is nothing that limits other existence beyond the 3 to 4 dimensions that we know about. Science is expanding knowledge about the early beginnings of the universe and the cause of the universe expansion (i.e. Big Bang. This is an unexplanable and without cause event as far as we know; other than to say that God was the originator of that event. There are many things beyond our ability to measure with our limited resources. The best an athiest can say is "to the best of my knowledge I have no experience of God". This hardly eliminates the existence of God. It certainly does not prove it, but the bible tells us there are thing we must take on faith. It is foolish for any person ro rule out the existence of God as that woudl imply that that person or persons have all knowledge. The world we live in today would never have been predicted by people 3000 years ago based on their knowledge. We have just receltly discover the substance called dark matter with occupies over 70% of the universe and that ordinary matter represents only about 10% of what we can actually measure. Imagine that for years we thought we knew about msot of the material universe, but know it comes to use that really have only been studying about 10% of the actual universe. There is nothing that says that even now the 10% we think we know about may only be 1% of the material in the universe. The more we study, the more we find out that we do not know. Therefore think carefully before you rule out God! The bible says that only the fool has said in his heart "there is no god".