From the inside, when you have faith you have moorings, direction, purpose that other people, the ones who do not have faith, lack. You are like a ship adrift, without a destination. You have a crew but no captain, no pilot, no compass, no charts. The matter of faith changes all that. You know where you are going.
Faith lends meaning to an otherwise meaningless existence.
It makes the whole matter of life worth while. Those of us who are getting a little long in the tooth can remember back to an earlier part of the twentieth century, when faith was much more common than it is now. The epoch that I have personally experienced has been extraordinary and probably unique in human history, in terms of the proliferation of rational thinking at the expense of faith. But this simply demonstrates the superior functionality of modern scientific thinking over religious doctrines that originated in the distant past, when people simply didn't know very much about the world they lived in. It does not mean that humans have outgrown their need to believe in something, to accept as given certain basic axioms.