Miracle is an odd thing to define. 3000 years ago it would be talking to someone who was 8000 miles away, seeing the dead walk, talk and fight with Darth Vader(Alec Guiness is dead, yet when you watch Star Wars, he is alive, miraculous!), or making a glass ball emit light, or making crops and livestock that grow to sizes that they could never do before.
To quote Arthur C Clarke, "Any sufficiently advanced technology is indistinguishable from magic."
In 500 years we might be able to talk to people a light year away in real time, disintegrate one place and reintegrate another, walk through a virtual world that exists within computers, live within computers, shirking our mortal vessals etc etc.
Miracle is highly subjective, because it's atributing to a deity some action that seems physically impossible. It's a sort of bet, 3000 years ago they were betting that you couldn't keep water cold in the desert, they lost the bet.
Declaring something a miracle is a risky business, because in all likelihood, you'll be proven wrong by time and tide.
Oh, and another good quote from Clarke "If there are any gods whose chief concern is man, they can't be very important gods."