Miracles are a bit of a perplexing subject for me. When you say "supernatural" you're really talking about some event or phenomena that happened outside the law of nature. While I agree that these events happen and can happen and can be driven by the intervention of God, I don't believe they're outside the law of nature. It might be a rare event, but not outside the law of His creation. I may just be arguing semantics here but while I agree that "spiritual" healings do take place, for instance, I don't believe it's outside the realm of natural law that it did happen. It's rare - it's like ball lightning! I've never seen ball lightning, but it's an event that happens and has been witnessed. But ball lightning isn't something we think of as an intervening act of God. However, it could be an intervening act by God to herald a message to the guy who DID see the ball lightning.
Now, the sunset I saw just last night and took a picture of for ya....
was beautiful enough for someone to say it was miraculous. We know it's a phenomena when the clouds are high enough in altitude to reflect light from a setting sun hidden from our view. We don't think of it as a miracle at a time on this earth when God has created this whole miraculous reality. All around us are miracles.
The LOSS of this knowledge leads people to destroy that which IS a miracle - only because we think we can explain it. Case in point would be the fact that we know how to makes babies. We know the process and are all too willing to follow it in explicit detail, then we give ourselves the option to destroy the outcome! Not because we know HOW this miracle happens, only that it CAN.
I'm digressing. Point is that the "belief" in a miracle is always harder to digest than a natural explanation. It some ways (and this is not for the believer, but the unbeliever) miracles are a hurdle too high to jump and prefer a pragmatic approach to the realization of a Universal God. For me - being a believer - knowing that these so-called miracles are really all well within the confines of the natural law God created, can make my own faith stronger. In other words, I think I can more likely believe in the "unbelievable" if I know it has not strayed from the path of reality, while still marveling at the everyday miracles around me.
How else could my corn grown 8' tall since I planted a seed last May....