"If"? You don't believe the scriptures?
Who walked on water in 2 Kings? It was an axehead, not a person walking.
Axe head or person makes not difference. Are you saying that walking a persons is sign of omnipotence, but floating a axehead is not? who draw the limit of what is to be omnipotent?
I will not distract the main porpose of this thread: kenosis. The Gospels do not say that Jesus walked over the water in the way we all visualice, steping on the water surface. The Gospels acount of Jesus walking over the sea, that is around the north coast. the Jesus walked into the water to meet the disciples that were aground. Jesus was walking in the shallow and truing to found a way (shallow waters) to reach the boat.
But that is not the thread about. Let say for a moment that Jesus did walk over the surface of the water in the same fashion Elisha did afloat the axe. Obviously is a miracle, but not a prove of an allmighty God.