I gave you one, the miracle of modern science, in the form of medicine for healing and radio and flight for the airstrike example. It actually owes its existence to the medieval monastery, but other than that it and priests have little to do with each other.
Modern science may be considered a "miracle," but it was not connected to God in any notable way. Not directly; priests may have helped, but God did not. If He did, he thinks in odd ways and conceals His work well.
Let's see if I have this straight; because I have some doubts as to whether I understand you.
You don't believe in god.
The miracle I use must come from god.
You've got a grasp on history and have your own explanations for the miracles of the bible, so it has to be something else. And the miracle of life and other such everyday experiences also do not cut it for you.
And this is all for the purpose of enlightening me as to why priests in a fantasy world must be magical instead of mundane?
Let's not turn this into a religious debate. If gods grant miracles, on a consistent, reliable basis, that's similar to magic. If a priest can ask his/her god to heal a cripple, that's similar enough to a healing spell that a game with both might as well use the same framework for it. That's essentially what I'm trying to say.
And in case anyone cares, I think that the Bible is what people saw at the time, slowly changed by word-of-mouth until biblical stories started being written books instead of told by word-of-mouth.