Temporal nature of the world?

Assuming the arrow of time as a premise that the past comes before the present, and the present comes before the future, temporarily. Could there have been a time where there was nothing before the origin of the something Christians call their God? Is there a universal explanation between the Christian faiths or is there a difference in protestant and catholic faiths in there explanation of the physical manifestation of the arrow of time and its consequence to God coming from ex Nihilo