on the 4min mile, pls note that before that the physiolgists
were only based on unproven theory, ie; there wasn't a subject or
person to observe or measure on to prove their theory. Hence, when
Roger Bannister comes along, and show it can be done, their theory
collasped.
yes, maybe in future, man can walk on water, or even grow wings to
fly, but as of this moment, based on current science and technology
and mathematics, these are not possible.

but then, this is not why you believe in God, not just about
miracles or wonders, for us, its about a relationship with a living
God.