I think the word "faith" occupies the same role in religious discussions that the word "socialism" occupies in political discussions. Once you hear the word in conversation, you simply have to check with your discussion partner to see if you and he or she are using the word in the same way. For some, faith is believing absent any evidence, or in the face of a mountain of counterevidence. For others faith is just proceeding confidently on what one take to be sound evidence in support of one's beliefs.
Now there is a position out there called fideism. According to britannica.com, this is what fideism is.
Fideism, a philosophical view extolling theological faith by making it the ultimate criterion of truth and minimizing the power of reason to know religious truths. They defend such faith on various grounds—e.g., mystical experience, revelation, subjective human need, and common sense. .
But many people in religious traditions reject fideism. Typical would be C. S. Lewis:
I am not asking anyone to accept Christianity if his best reasoning tells him that the weight of evidence is against it. That is not the point at which faith comes in. But supposing a man’s reason once decides that the weight of the evidence is for it. I can tell that man what is going to happen to him in the next few weeks. There will come a moment when there is bad news, or he is in trouble, or is living among a lot of other people who do not believe it, and all at once his emotions will rise up and carry out a sort of blitz on his belief. Or else there will come a moment when he wants a woman, or wants to tell a lie, or feels very pleased with himself, or sees a chance of making a little money in some way that is not perfectly fair; some moment, in fact, at which it would be very convenient if Christianity were not true. And once again his wishes and desires will carry out a blitz. I am not talking of moments at which any real new reasons against Christianity turn up. Those have to be faced and that is a different matter. I am talking about moments where a mere mood rises up against it.
Now faith, in the sense in which I am here using the word, is the art of holding onto things your reason has once accepted, in spite of your changing moods. For moods will change, whatever view your reason takes. I know that by experience. Now that I am a Christian, I do have moods in which the whole thing looks very improbable; but when I was an atheist, I had moods in which Christianity looked terribly probable. This rebellion of your moods against your real self is going to come anyway. That is why faith is such a necessary virtue; unless you teach your moods “where they get off” you can never be either a sound Christian or even a sound atheist, but just a creature dithering to and fro, with its beliefs really dependent on the weather and the state of its digestion. Consequently one must train the habit of faith.
C.S. Lewis, Mere Christianity, ch. 12
For Lewis, faith does not contradict reason.
Consider the phrase "I have faith that Biden will do a good job for the rest of his term as President." People who do that are not saying they have no good reason to think he will do a good job, though they do not know what Biden will do during the remainder of his term. But if you find Biden's track record so far to be one of good leadership, then you might say you have faith that his remaining actions will also be good. (Of course, if you think his track record so far has been bad, you understandably don't have so much faith). But your using the word "faith" in this context is not an admission that you have no good reason to believe that Biden will do well, only that you are not in a position to perceive his actually doing well, since you are talking about future events you can't now perceive.
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