Is there really any miraculous event here?
The disciples get into a boat and row up the coast without Jesus
showing the following crowds that Jesus is not with them, cunningly.
The wind gets up so they have difficulty keeping the boat in place.
Eventually Jesus appears, wades out and tows them back to land,
which is where they meant to be in the first place, but
the crowds have been deceived and melted away.
This is not a deep lake but shelves gradually.
There was never real danger only some discomfort.
It would seem that a mountain has been made
out of a marine mole-hill.
There is a lesson here, of waiting for Jesus,
of faith and willingness to take risks,
even, maybe, of dependency on Jesus,
or even of overdependency on him,
but not of puerile magic powers.
We might ask why Jesus intended to pass them by in Mark's account
or the story is endorsed in Matthew's by Peter's attempt to walk on water,
or in John's by the addition of a claim of divinity.
Again the story itself varies between accounts.
Again it contains elements which subtly point to its non-literal nature.
Even so the power-brokers of religion major on the charismatic elements.
The tendency of charismatic speakers, even today,
to add a spiritual component into a natural situation
can pervert any story from credibility into propoganda, to the detriment of Christian credibility.