A humanity which believes in nothing except that which is proven is lacking, is unhealthy.
Idealism, hope, morality. Faith in the ability of humanity to improve. Without faith we would stagnate. Without reason stagnation might be preferrable.
Confidence is a different context of "faith" than the one the OP is asking about.
Nobody denies the utility of confidence in something like the future of humanity, confidence in our friends, confidence that we can accomplish a goal.
That is NOT the same context of faith as believing in a deity on faith.
This is, as I've been saying, a huge problem in the "faith" discussions: faith supporters will often flicker between different contexts of faith, equivocating them as if they are the same.
Skeptic: Faith in things without evidence is irrational.
Believer: But don't you have faith the sun will rise tomorrow?
Skeptic: Ah, but that's equivocating two contexts of faith. One is unsupported belief that something exists, the other is the use of induction -- which is different.
Believer: Fine, then, what about faith in a friend to loan them $5?
Skeptic: More equivocation. I have confidence my friend will return my $5 from my experience with them, and I certainly know through reason that they even exist. This is entirely different from having the unsupported notion that some ineffable being exists through "faith."
Equivocation -- it somehow keeps this "faith" concept alive, when really there are like three different kinds of "faith."
One of them is most certainly irrational: belief in the existence of things without evidence.
Does ANYONE dispute that? Anyone at all?