Without a clear idea of what we mean by faith, it could be all sorts of different things. Does faith mean belief absent any evidence, or belief in the face of a mountain of counter-evidence? Then of course the Muslim can have faith, and the Mormon can have faith, and the Catholic can have faith, and the Protestant can have faith, and the person who believes in the Flying Spaghetti Monster (Pastafarians) can have faith.
Some people like to quote the Hebrews passage, "faith is the substance of things hoped for, the evidence of things not seen." Without further explanation, that doesn't do much for us.
Let me quote C. S. Lewis: "I am not asking anyone to accept Christianity if his best reasoning tells him that the weight of the evidence is against it. That is not the point at which faith comes in."
So what is faith, and what is the point where it does come in?