God becomes what he is through the world, which is endlessly becoming itself, the process continues forever. Rosenzweig states that God becomes himself by not becoming what the wolrd is becoming. I have no idea what this could mean. Rosenzweig ends by saying that theology is based on revelation, which is lived experience, and can therefore make claims about reality, unlike philosophy. Philosophy can only choose among possibilities with no lived experience to speak of.
Creation is the subject of both theology and philosophy.
God and human act on the world, God reveals himself to the human, who redeems the world. God and human are linked by revelation. The universe begins at time zero with a single infinitely small amoutn of energy with infinite temperature and density. Basically we have a small point of hot energy. Upon its destruction, the particle emits radiation, which is the primary source of energy.