“Say: If the whole of humankind and Jinns were to gather together to produce the like of this Quran, they could not produce the like thereof, even if they backed up each other with help and support.” Al Quran

What is a miracle?
I think it is necessary that we have a clear picture of what we mean by a miracle. Here are some definitions:-
"An event that appears so inexplicable by the laws of nature, that it is held to be supernatural in origin or an act of Allah." "A person, thing or event that excites admiring awe." "An act beyond human power, an impossibility."

It is logical that greater the impossibility, greater the miracle. For example, should a person expire before our very eyes and is certified dead by a qualified medical man, yet later on a mystic or a saint commands the corpse to 'arise!', and to everybody's astonishment the person gets up and walks away, we would label that as a miracle. But if the resurrection of the dead took place after the corpse had been in the mortuary for three days, then we would acclaim this as a greater miracle. And if the dead was made to arise from the grave, decades or centuries after the body had decomposed and rotted away, then in that case we would label it the greatest miracle of them all!

A Common Trait:
It has been a common trait of humankind since time immemorial that whenever a guide from Allah appeared to redirect their steps into the will and plan of Allah; they demanded supernatural proofs from these men of Allah, instead of accepting message on its merit. For example, when Jesus Christ (pbuh) began to preach to his people – "the children of Israel" – to mend their ways and to refrain from mere legalistic formalism and imbibe the true spirit of the laws and commandments of Allah, his 'people' demanded miracles from him to prove his bona fides (his authenticity, his genuineness), as recorded in the Christian scriptures:

Then certain of the scribes and the Pharisees answered, saying master, we would have a sign (miracle) from thee. But he answered and said unto them, "an evil and adulterous generation seeketh after a sign (miracle) and there shall no sign be given to it, but the sign of the prophet Jonas (Matthew 12:38-39 holy bible).

Though on the face of it, Jesus (pbuh) refuses to pamper them here, in actual fact, he did perform many miracles as we learn from the gospel narratives.

The holy bible is full of supernatural events accredited to the prophets from their lord. In reality all those 'signs' and 'wonders' and 'miracles' were acts of Allah, but since those miracles were worked through his human agents, we describe them as the miracles of prophets (i.e. Moses or Jesus (pbuh) by those hands they were performed).

Quirk Continues:
Some six hundred years after the birth of Jesus (pbuh), Muhammad (pbuh) the messenger of Allah was born in Makkah in Arabia. When he proclaimed his mission at the age of forty, his fellow countrymen, the Mushriks of Makkah made an identical request for miracles, as had the Jews, from their promised Messiah. Text book style, it was as if the Arabs had taken a leaf from the Christian records. History has a habit of repeating itself!