The word miracle comes from the Latin mirari, meaning to wonder, and is an event that is not explicable by natural causes alone. A reported miracle generates excitement because it appears to demand, as its cause, something beyond the reach of human action and natural causes.
Historically, miracles has been the basis of favoring specific theistic religions, the argument typically being that the event in question can best or indeed only be explained as the act of a powerful deity. Certainly that which cannot be expected to happen again is not that which science can evaluate.
It is the belief of Christians that Miracles are not only possible but are matters of fact. Whether they occurred by the actions of Christ Himself or by those to whom He bestowed a portion of His power, one has to accept that the Word as stated in the Gospel of John 1: 1) 'who made all things seen and unseen and without who, nothing was made that was made,' is able to manipulate the quantum-mechanical aspects of the universe He created in order to achieve whatever outcome He desires.
However, inward sight alone can convince of spiritual truths but wonders and miracles themselves, never.
The 37 miracles of Jesus Christ that were detailed in the New Testament served a specific purpose. Not one was performed for either amusement or show. Each, either met a serious human need or confirmed Christ's identity and authority as the Son of God. At times Jesus refused to perform a a miracle because it would not have fallen into one of these two categories. (Matthew 12: 8-32.)
The Miracles of Jesus were small when compared to the continuous, life sustaining, all embracing works of His Father and were made small so that we might better understand them. Poor indeed was the miraculous making of wine in the stone jars at the marriage feast in Cana when compared to the abundant growth of vines throughout the world with their clusters of ripening grapes, gathering from the earth the water that had to be carried in pitchers and then poured into the stone jars at Cana.
The same can be said with the feeding of the five thousand from a few loaves and fishes. In each case with Jesus' miracles they were always a reflection of the life sustaining works of God. Stones were not turned into either bread or fish but existing bread and fish were multiplied to abundance as exhibited by the baskets of leftovers that were gathered up afterwards. Jesus also revealed his control of the environment by calmng the waves and stilling the wind.
The miracles of Jesus are precious as interpretations of the larger works of God and are the outcome of our Lord's empathy with ordinary human endeavour.
Disbelieve miracles and the Resurrection itself, the greatest miracle of all, would have to be disbelieved.