This is always an interesting issue. But does it really make sense to ask of an omnipotent being how they did something. For example, I once beat a Grandmaster in a chess tournament. Now, you might ask how I did that, since as someone whose rating has never gone above expert, you might wonder how I did that. (And the answer isn’t all the flattering, was able to win because my opponent had had entirely too much to drink.) But if I have all power, then the simple answer is that I used the power of omnipotence to get it done.
Since it is at least possible that an omnipotent being occasionally works through secondary causes, the question at least makes sense. For example, if I remember correctly, Richard Swinburne says that God fine-tuned the initial conditions of the universe and the values of the various constants in physical laws of nature, such that intelligent beings like humans would evolve. In one sense, we might say that, on Swinburne’s view, God’s fine-tuning of the universe explains the evolution of human beings. In other words, Swinburne might say, “The explanation for the existence of human beings is that God fine-tuned the initial conditions and constants of the universe in such a way as to cause the evolution of human beings.” Now suppose we ask, “But what explains the initial conditions and constants of the universe?” Suppose Swinburne said, “God used the power of omnipotence to get it done.” That statement may very well be true, but we wouldn’t have an explanation in the sense I have been talking about in my last few posts.