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Faith appears to be a placeholder term and its meaning shifts depending on whom you ask.
According to the bible, faith means “Now faith is the assurance of things hoped for, the conviction of things not seen” (Hebrews 11:1, esv).
In the plain sense, this means that you cannot be sure – an assurance based on hope and without direct evidence. Some might claim this excludes the four other senses that provide direct evidence, but this is a childishly silly response; I doubt the same people would want the same pedantic knee-jerk applied to all the other verses in scripture. So, faith is explicitly stated as without physical evidence, and this comports with other uses in scripture (i.e. “doubting” thomas).
Additionally, the Christian faith is (currently) centered around “knowing” that God exists, it loves you, and wants a personal relationship with you. Since the Christian 'sees by faith,' This is immediately and obviously impossible.