Is it really that hard to articulate a good reason for why you believe the Christ mythology?
Here is the articulation plain and simple.
The theist has reason to believe God exists and miraculously created this universe. Thus if God exists and created the universe, then walking on water would be a cinch for him. Really its that simple. If its reasonable that God exists then it reasonable miracles are possible.
Is that reasonable?
To clarify, I'm not asking if God's existence is reasonable. I'm asking you if you understand that miracles would be reasonable given that God exists? For that was the context of your query.
Essentially this is a simple modus ponens argument.
P → Q
P
⊢ Q
In this case
P="God can perform miracles that violate the laws of nature."
Q="God can make Jesus perform miracles that violate the laws of nature."
The logic is valid but the argument has yet to be demonstrated to be sound. In order to be a sound argument a god who can perform miracles that defy the laws of nature must be demonstrated to exist. To date nobody has produced such a god, nor has anyone been able to produce evidence of the influence of such a god that can withstand critical scrutiny. This is true under the weight of millions of such claims. In spite of this it is always possible that such a god exists. It is equally possible that the next time I let go of a lead weight it will plummet skywards rather than towards the surface of the planet.
This is because of the principle of inductive reasoning. If an observation can be made reliably by anyone who cares to perform the same tests, and if nobody ever observes contrary results it is rational to accept that the observation reflects reality.
Miracle claims parallel the observations of gravitational phenomena perfectly. If I watch a magician levitate a person or object I can be certain that if I find out how it happened I will discover that no miraculous suspension of the laws of physics were involved. There will be a support structure somewhere that facilitates the illusion. If I hear someone claim that there is someone who can accomplish this without resorting to any tricks I can be certain that they are either deluded or lying. Invariably such claims can be demonstrated to be false.
Similarly, every time a supernatural claim has been made and it was possible to validate whether or not the supernatural was involved, not once has it ever been demonstrated that it was through the agency of some supernatural power. There is
never a monster under the bed. All we are left with are unverifiable claims. God heals headaches regularly but never restores an amputated limb. The effects of God's power is exactly the same as it would be if God did not exist.
Because of these things it is reasonable to reject such claims. This is no more dogmatic than accepting the truth about what is going to happen when someone suspends a lead weight several inches from the floor and then lets go.
Jesus could have demonstrated what he was talking about by moving a mountain into the sea. Or he could have actually given believers that ability to be used today when someone is trapped under an automobile or something. We'd be able to investigate and be amazed at the repeatable power of God when called upon. Instead, every miracle recorded about Jesus left absolutely no trace of it having been performed, down to and including the cursed fig tree. What's more, stories of these miracles didn't begin to surface until decades after their alleged occurrence, conveniently eliminating any chance of investigation or gainsay by people who happened to be there, assuming this Jesus character actually existed at all.
Far from being "evidence" as Lumpenproletariat keeps insisting, these tales are laughable relics of a bronze-age mythology that as a species we've outgrown. Sure there will be people clinging to it for decades, perhaps even centuries. But it has already evolved way past the days when people wasted tons of money and resources attempting to find relics of a story that never happened.