The way it is related the only reason they don't say 'from men' is for fear of the reaction from the populace. That hardly makes their answer honest.
We would only be in the same situation if questioning the divine authorship of the bible was likely to result in the disfavor of some faction whose good opinion was required.
Are you most honest when you admit that you don't know that the gospel wasn't written by the flying spaghetti monster? This sort of 'last Thursdayism' seems the antithesis of a productive approach to anything, merely abrogating the very possibility of knowledge, beyond the fundamental Cartesian '
Cogito ergo sum'.
TTFN,
WK