The 1st premiss

The question is whether the principle of causation breaks down with the physical laws at the beginning of the physical reality. To answer it we need to understand if the law of causation is dependent on the physical reality. If all of the laws of physics are, our law isn't. It depends only on being and non-being. That's all it operates with. Now, if non-physical existence is possible, the law of causation is valid. So far, non-physical being was not demonstrated to be impossible, therefore we are justified to use the law of causation beyond the physical universe and refer to a non-physial being that caused the physical universe.