God must exist because something must have caused the first moment in time and that something is God. This is summarized by, Saint Thomas Aquinas in his theory of cause. He presented five arguments for the existence of god in his masterwork the Summa Theologiae. In the argument about casualty he stated the following premises:
             1. The natural world includes events that occur.
             2. In the natural world, every event has a cause, and no event causes itself.
             3. In the natural world, causes must precede their effects.
             4. In the natural world, there are no infinite cause/effect chains.
             5. Hence there is an entity outside of nature (a supernatural being), which causes the first event that occurs in the world.
             In our finite world of existence, an event cannot cause itself, and if there is no first cause, there would not be any effects. So, God is the first cause. God must exist since all his premises are all in support of his conclusion that the first cause is God. An atheist is likely to say that the Big Bang was the first cause, but Aquinas's premises and conclusion will refute this theory, as we will view later. I agree with this theory of cause, because I believe that our existence could not just happen in our finite world, something had to have created the first moment ever and that something is God.
             Can an event be the cause of itself? If we look at the following example we would have to say no: You and I are both humans, but we are not the first humans and neither are our parents, or our grandparents etc. So how can we conclude that an event can cause itself? We can't, and the answer is that the only thing powerful enough to create such a thing like humans comes from a supernatural force. This entity outside of nature (supernatural being), which causes the first event that occurs in the natural world, is God. Something had to start the first moments in this world and I g
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