There is more documentary evidence for the New Testament than for any other ancient document. Yet how many modern people would accept without question that Caesar invaded Britain in 55 BC or whenever just because they read it in Caesar's Gallic Wars ?
Water into wine - why not ? Walking on water ? Why not, ought to be straightforward for the Son of God.
Why should the NT have to be scientifically sound ?
Why would the writers of the NT make things up ? I cannot see any possible motivation for Paul to write a pack of lies and 'invent' a religion. Moreover, I cannot see why a group of utterly depressed disciples, frightened after the crucifixion of their master, should suddenly transform into joyous martyrs - a man does not die for something he knows to be a lie.
It's nothing to do with intelligence Spock, keep your scorn for more deserving subjects.