The Argument from Motion for the Existence of God is often credited to Aristotle and adapted by Aquinas. It goes as follows: we see that nothing moves unless something else causes it to move. Therefore, nothing in the universe would move unless some unmoved Mover provided the original "push." This is God.
Problems include (1) Animals and people move of their own will or volition. (2) Even if a valid argument, all it proves is some original mover, which has none of the Christian characteristics of God. (3) It is as equally possible that the universe has always been in motion, and the origin of the universe is beyond the capacity of human beings to comprehend.
I hope this helps stimulate your own thinking.
