If we agree on this axiom, we have a foundation to build upon, to create or agree on other axioms that we can verify against our current experience and consciousness. The axiom 'no thing can arise from nothing' is the closest, un-provable agreement we can have to understanding the 'why' and 'how' of life, for in it lies the basis of our belief system. The basic fundamental evidence of life any individual can have, is his experience. But in order to 'experience' we must be conscious. Despite widely spread notions that everything is 'relative' and that we 'can't know the truth', we still hold proof of our consciousness, this is in our ability to create activity.
Activity is the only thing that is traceable to consciousness.
Both hold minute forms of activity if we study the atoms they are made up of. Even with this lack of concise definition for 'consciousness', the axiom is that we are still conscious, which we experience by our ability to create activity. If we deny the axiom, we essentially deny our existence. If we accept the axiom, and with it the axiom 'no thing can arise from nothing', then we are left a working hypothesis, or agreement about the 'why' and 'how' of life. Many people call this 'something' 'God'.