A miracle is understood in different ways. There's the common modern understanding of something that is essentially remarkable, but in Christian terms, a miracle is more specific.
In the Gospels, for example, miracles are events which prove the claims of Jesus, enacted either by Him or by His Apostles. They are, most simply 'acts of God'. They require firstly an understanding of the normal, natural run of things, because a miracle is an event that only God could enact, because that's the point in Christian terms - they are supposed to be 'proof' that the claims being made are backed up by God.
Now, personally, I'm fine with believing that the things described in the new testament happened, including, fairly obviously, the resurrection. As St Paul says, if it didn't happen, then Christians are pretty pitiable.
Some people do take a more intellectual approach and a certain amount of sceptical theorizing in recent decades has gained a following, playing up the symbolic aspects of miracles over and above the physical reality of them. My own view is that it's wise to hold these things in tension.