@Pyrrho,
Well perish the thought of what would happen to the boating industry, should it turn out to be true.
I have a question, though. The image of 'walking on water' actually has a pedigree in Western culture, in that Jesus Christ was said to have done so, in the Bible. Indeed 'walks on water' is a common idiomatic expression for 'one who is perfect in every way'.
I ask myself: do I believe it, in the case of Jesus Christ? And actually, I find this a difficult question to answer. For if I doubt it, then there is no reason not to doubt all of the other accounts of the Life and Teachings. Then it is but a short step to believe that all of those accounts really are just mythology. And from there, to the conclusion that the spiritual foundation of Western culture is but delusion and fancy. And indeed this seems a conclusion many are ready to accept.
On the other hand, if I believe it, what does that mean? Under what obligation am I placed, if I believe it to be true? Does it mean I am well advised to be a Christian?
These are quite difficult questions, I think. They are easy for those who utterly doubt them, and easy for those who just accept them. But I don't find them easy questions.
But as for someone claiming to walk on water, or saying it can be done, I would be completely skeptical.