Miracles are events that are not explainable by natural or scientific laws. You just assume that anything that is real will always be ipso facto explainable by natural or scientific laws, but you can't actually know that for a fact.
Yes, you can.
The physics of everyday events is now completely understood; It's not possible in our theoretical framework for there to be unknown forces or particles influencing events on scales larger than nucleons but smaller than solar systems, so either all of modern physics is wrong (it's not, we checked), or any events not explicable by scientific laws are incapable of influencing anything we can detect in any way whatsoever.
The difference between something that has no effects and is undetectable, and something that doesn't exist, is of no real interest to me; Likewise I am not particularly concerned about hypothetical supernatural forces whose only effects are on the movement of galactic clusters.
The Standard Model, and the principle of mass-energy equivalence, do not permit the existence of unknown forces at energies below the maximum energy density achievable in the LHC. The discovery of the Higgs particle completes the theoretical model, and for there to be other influences on matter that are currently unknown at these energies would imply that quantum field theory and/or relativity are wildly wrong. We know that at least one is wrong (because they're incompatible at ultra high energy densities), but we have tested both sufficiently to know that neither is wrong enough for there to be any unknown influences under conditions compatible with human life.
For a hypothetical god to cause a hypothetical miraculous act on Earth would either influence several cubic lightyears of matter in the exact same way, or it would necessarily vapourise the lucky recipient of His miracle.
Or maybe all of physics is wrong, in ways that are obvious, extreme, and radical. But we didn't notice yet. I find that a fairly implausible claim, particularly when it's being made in support of supernatural phenomena that we have no good evidence for at all.
Insofar as it's possible to know anything about anything, it is not only possible, but has now been demonstrated, that supernatural phenomena cannot influence humanity in any way whatsoever. Which is another way of saying that such phenomena do not exist.
The great achievement of twentieth century physics was to unite everything (except gravity) into a single model. That unification closes the gaps, and gods of the gaps are thereby eradicated as possibilities. That you aren't personally aware that there are no longer any gaps to fit a hypothetical supernatural into isn't an indication that such gaps might still exist, it's just an indication that you don't yet understand modern particle physics. That's OK, most people haven't the time nor the inclination to study such a narrow field to the necessary depth. And even those who do, were quite surprised to realise the wider implications for philosophical arguments that, at first glance, don't appear to be related to particle physics at all.
Substance dualism has been proven to be wrong, by the simple expedient of demonstrating all of the ways in which matter can be influenced. There cannot be any remaining unknowns, unless everything we know, and rely on daily, is completely wrong. And it's not. We checked.
Substance dualism is exactly equivalent to asserting E≠mc
2. It can only be true if all the stuff we currently know is false. Which leads me to wonder just how incredibly lucky we must be that it works anyway.
