The heretic Vincent Cheung denies the ontological reality of second causes, while, as it must noted, he does not deny their epistemic reality. Cheung as a Hyper-Calvinist makes God the Author of Sin, and he is proud of it. But this kind of direct agency and strong Occasionalism would result in an interesting problem: How does Cheung deal with the death of Christ?
The death of Christ is ordained by God, but in the traditional Calvinistic understanding the Pharisees and Romans freely put him to death, without compulsion from God to do such a wicked act (cf. Acts 2:23). But if one takes Cheung's position, one must assert that God directly cause the Pharisees and the Romans to put him to death. In other words, since God the Son is God, what we have here is divine sadomasochism, or, since they are two different people, divine child abuse. Of course, such conclusions are absurd, but one must take these positions if one believes in only direct causation. And no, I do not admit the blank assertion that God is not "X" because by definition He is not "X." I am done arguing with extreme Nominalists, who think that defining their way out of actual problems in their theories makes valid arguments.