If God were so powerful, why would he depend on the testament of prophets? Wouldn’t it make better sense if he revealed himself through nature, download his message directly into our consciousness through reason?
He does reveal himself through nature… " since what may be known about God is plain to them, because God has made it plain to them. For since the creation of the world God’s invisible qualities—his eternal power and divine nature—have been clearly seen, being understood from what has been made, so that people are without excuse." (Romans 1:19-20)
However, His love for us cannot be fully revealed through His creation anymore than your love for your mother can be fully communicated through the nice gifts you buy her for her birthday. This is where revelation comes in. Why through prophets and not directly into the mind of each individual? The theology behind this could fill an entire thread I’m sure, but it boils down to several factors a) free will (God wants lovers, not slaves) b) our separation from God (sin is very real and very obviously ungodly, and we are all even more obviously guilty of it. To paraphrase the most famous Catholic orator of the 20th century, “The light of God cannot shine fully into a sinful soul any more than the light of the sun can fully penetrate a dirty window.” The eyes and ears of our souls are caked with sin and thus largely unable to hear God.). This is also why the prophets are so few and far between. They are exceptional individuals to whom God could most clearly communicate. Even so, they lacked the perfection necessary to get his message across completely. In such, we find the reason and necessity of God’s becoming His own ultimate prophet, as well as our savior, in the form of Jesus Christ.
God’s revelation of Himself through nature is merely a first date. From a theistic perspective, God does not want to be our “secret admirer.” He wants us to know Him fully. His thoughts, His will, His glory. Ultimately, he wants us to be His “bride.” Courtship begins with overtures (in this case, our world) and develops through deep personal communication. This is the entire point of revelation, religion, prayer, devotion and all the things we associate with them. It is a deepening of a relationship of which, on our own, we have only a miniscule knowledge.
Now, tell me, would you call a scientist making a robot and programming it to show him affection, obedience and reverence “true love”? Because that is exactly the kind of relationship with God your proposal suggests. I think I’ll take my God, thank you very much.
Are we to separate the supernatural from the natural so much as to assume all of nature as external to God? Isn’t nature precisely God’s work, and thus as good his written word as everything else?
No, you are creating a false dilemma. Nature is God’s creation and is therefore external to Him in the sense that it is not Him. Yet he permeates it, as he does all things natural and supernatural, because all things derive from and depend upon Him for their existence. I don’t quite understand your second question, but I’ll do my best with it. Nature is indeed as good as God’s written word, but they are still two separate things and one is not complete without the other, in the same sense that a bike’s frame can be just as perfectly made as its tires, but one without the other is not a fully functional bike.
If God so ordained natural law for everyone and everything, why would he elect to bend it on a prayer? Isn’t that being unfair?
“Natural law” is not the laws of nature, which I assume is what you are really referring to. And God is completely unfair. If he were really fair, He wouldn’t permit our sinful existence. But this is besides the point. You are “thinking as man thinks and not as God thinks.” In the end, to the person of faith, this Earthly existence is but a prelude to our true existence and thus we do not stake our faith on what graces we receive compared to others in this life. We trust that God knows what we each need individually for our perfection and strive to live the holiest life we can. A miracle here or there can work to invigorate the faith, and thus the lives and actions, of many. Miracles everywhere for everyone would do little but create a spiritual welfare state.
You might almost consider the occasional miracle a postcard from God.