People survive windstorms and sandstorms in the dessert as normal every day occurrences even though they do not happen every single day of the year. These people were not out of their element. If you want to say that God used a sea breeze and miraculously held the water back for 4 hours. Or God used a gale force wind and the Hebrews did not even feel it, or some combination in between, it would not change the fact that it happened or not or that God was involved or not. It may help some people to understand it a little better to view it from their perspective. It is not that big stretch of imagination to say that God did it from natural causes any more than he did it supernaturally. Neither do I think that it does any disservice to God to say that it was a mere natural event. That is the point that most modern humans think that God only works in mysterious ways. God is the same today and today he works the same way in the natural and mystical. What does God a disservice is to say he does not work at all, or limit God to only one perspective.
The problem is, if you say that an event had 100% natural causes, then it becomes meaningless to say that it's an act of God at all. Let's say that there really was a wind that blew over the Red Sea and pushed the water back, and that this wind be explained naturalistically (some freak air current over the Levant or something). What does it
mean to say that that was an act of God? After all, there are gazillions of events happening at any given time that can be explained naturalistically. There are, right now, billions of air molecules moving over the Red Sea in ways that don't result in the water being pushed to one side. Those movements can also be explained naturalistically. Are they also acts of God? If not, then you need an explanation that shows why one event is an act of God and another isn't, even though both events can be explained equally naturalistically. And if you think that they are all acts of God, then "acts of God" just becomes meaningless. Everything that happens is an act of God, and that's no different from saying that nothing is an act of God. What is the difference between saying "God used a gale to push back the water" and "a gale pushed back the water"? Where's God in it at all? Why not say equally well that "the devil used a gale to push back the water" or "Glycon used a gale to push back the water" or indeed "I used a gale to push back the water"? Aren't they all equally true?
Here's another way of putting it: if these events are explicable in terms of natural causes, then there's no room left for God. If natural events cause them
and God causes them then you have overdetermination, which is incoherent.
Yes, God absolutely works through the normal laws of nature. He can do it on a grand scale, or he can do it behind the scenes in every day life.
Again, it's just not coherent to say that. Either an event is explicable in terms of the operation of laws of nature or it is not. If it is, then God has no explanatory power: the event was caused by the operation of laws of nature, and God adds nothing. If it isn't caused by the operation of laws of nature, then it's a good old-fashioned miracle and there's no need to try to explain it naturalistically.
There are alternative views to this. For example, you might be an occasionalist and believe that God directly causes all events, whether miraculous or not. Then the laws of nature actually describe how God behaves, and events that conform to those laws are acts of God just as much as acts that don't conform to them. However, if you take this view then
everything is an act of God, and there's nothing special about any event, at least not in that regard.