"Proof" is something a group of scientists or other fact-based theoretically impartial observers by concensus declare to be, in fact, true.
What constitutes proof is decided, then, by men.
What constitutes Faith, however, is up to man.
Interestingly enough, when scientists get down to the molecular ordering of life, and subatomic string theory, and fractals, and things of such detail and order and beauty many of them will tell you that their faith in God is increased. I know mine was.
I bet Mamma Gump had something pithy to say about the nature of "proof".
XOXOX
MaryAnn