I suggest you do some research on the Standard Model of the universe which is the model based on Einstein's research in General Relativity. It is also the standard model that has been verified by the scientific community for the past half century through various means of observation and corroborative research.
The Law of the Conservation of Mass and Energy has nothing to do with the age or origin of the universe.
The law states the both mass and energy cannot be destroyed. They can only change state from one to the other. If something cannot be destroyed it is then enternal and may have even always existed. If it is eternal, why do we need a god to create it?
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