What is God? Who is God? Why do some people conclude that a God exists? Saint Thomas Aquinas goes from the fact that there must be a first efficient cause to the conclusion that God is that cause. Why must Aquinas make the extraordinary jump from there being a cause, to assuming that this cause must be God? Would it not be just as plausible to make matter the first cause? Matter is the substance that any physical object is composed of. Matter is closed and finite, with no beginning or end. The best explanation to the existence of God, is that ....