In our contemporary society, it is almost automatically assumed, primarily under Immanuel Kant’s influence, that the mature adult must attain moral autonomy and question critically every directive that authority makes. When I was much younger, I think I would have found this a persuasive position, especially in the wake of the civil rights revolution, the Vietnam War and, of course, Watergate. Yet in the real world this is impossible. It is impossible to question authority in general. If we see fit to question specific manifestations of authority—as indeed we must—then we necessarily do so based on some other authority which we accord priority. This is what the apostles did in the book of Acts when they claimed to be obeying God rather than mere human beings (e.g., Acts 5:27-29).
The opposite of trusting God’s words is not merely distrusting God; it is choosing to trust someone else instead. For people, that started in Genesis 3.
That was a good line in your MCBC SS—I used it in Biblical Worldview: Creation, Fall, Redemption, with proper attribution.