The cycle of cosmic life

What happened before the big bang? How did the smallest building blocks of life and matter develop? Do thinking corporeal beings of the higher spiritual order, for example humans, have an ego-consciousness on the basis of the law of conservation of energy? Where does the cycle of cosmic life close? Is there a purpose why the universal world exists in its entirety? And for the fact that it is set up as it is? Is there such a thing as god or gods? As they are called on some habitable planets? And if so, what should we know about him or her? Are they possibly a product of spiritual fantasy of thinking, physical beings of the higher spiritual order as a means of developing and maintaining power? What distinguishes the species of thinking corporeal beings of the higher spiritual order? Is there such a thing as the spiritual, especially a fundamental difference between spirit and matter?