I have long suspected that when the majority of us speak of miracles we are talking not so much about events that violate the known laws of nature as events that have special meaning, either because of the timing or unlikeliness of said events.
A case in point is this item from Father Dwight Longenecker that has had me thinking lately. I urge you to click that link to see the picture and read the story.
The skeptic would say "so what?" But the people who were there and witnessed this event in person have obviously found deep meaning in it.
I don't think it wise to waste time arguing with the skeptic.The natural minded person is just bound to see things differently from the spiritually-minded person - and I think that's fine. It's a difference of perspective. Live and let live.
For the spiritually-minded person the Cosmos is a miracle of sorts, pointing directly to an intelligence behind it. Therefore we think there is meaning and significance to be found in all this. For that reason the concept of miracles - or unusual meaningful events - make perfect sense to us, even if it is only in the eyes of the beholders.