I've read a bit of what's been heretofore posted, but not all of it. So, please forgive me if I am rehashing anything.
Since the question attempts to draw a distinction between 'faith' and 'reason', for the purpose of measuring their values against one another, then I am going to assume we are talking about a type of faith that is accepted without justifiable reasoning. So, I am going to qualify my answer as only applying to 'blind' faith, that which functions as a guiding behavioral mechanism without the benefit of rationally extrapolated supports.
And I'll probably need some scotch and water for this . . . Yeah, that's better.
Okay, as someone else wrote earlier (forgive me for not properly crediting the author, as I simply can't remember who it was), there is a huge difference, or so it seems to me, between 'faith' and 'blind faith'. If one has justifiable reasons for 'betting' on the unknown outcome due to rationally supported extrapolations, then that 'faith' falls within the camp of reason. If one has no justifiable reason for betting on a particular unknown, then they are acting on 'blind faith', one might say.
I have 'faith' that my Titans will beat the Redskins this weekend, based on certain rationally extrapolated expectations. The Titans are simply, in my opinion, more skilled and deeper on both sides of the ball. Plus, our defense can be monsters when fired up. It would be a position of absolute 'blind faith' to assume that Jesus himself is going to enter the game as our starting quaterback since we seem to be a bit weak at that particular position given recent injuries to both Vince Young and Kerry Collins. Although I will add, I would love to see the son of God throw the deep ball to Randy Moss.
Once a certain religious person told me that 'salvation was only attained through blind faith'. Then that person proceeded to give me explanations, some quite reasonable, for believing in the concept of 'salvation' and the need for it. To which I claimed their belief wasn't a matter of 'faith' but one based on reasoning, albeit somewhat flawed reasoning, in my humble opinion.
So, I suppose I personally believe the future well-being of humankind would be sorely undermined if we had to proceed without 'reason'. Conversely, however, I see no 'reasonable' harm, none that can be positively and conclusively identified, by proceeding headlong into the future without 'blind faith', leaving behind forever a type of faith that seeks not only to explain operative 'how's' and 'why's' of this world without any basis in reason but which is also used to bind 'non-believers' to its will.
Actually, this particular post required TWO glasses of scotch to complete. I guess I'm a more prolific drinker than philosopher. So it goes.