If the universe was made by God and if God is all-powerful, then God must controleverything. 'God sustains the universe' meaning that he holds it in existence and preserves it from destruction
Psalm89:9-10 - God rules the raging of the Yam (The sea) and crushes the Rahab like a carcass. Psalm104:5 God 'set the earth on its foundations, so that it should never be shaken' - God sustains humanmorality by providing a code by which Christians are expected to follow e.g. The 10Commandments and teachings of Jesus
Christians vary in their interpretation of God as the controller of all things. For some, because God is the onlyGod and omnipotent, he therefore must also be omniscient. If God knows everything, including the past, present and future, meaning that the future is fixed and pre-determined (Theological determinism) Aquinas' view is that God doesn't exist in time, he exists timelessly. God can be outside time, but he can't control it