The definition of faith straight out of the Bible (Hebrews 11:1, emphasis mine):
Now faith is the substance of things hoped for, the evidence of things not seen.
Many people who claim to believe the Bible also say "Well, you've just got to have faith." What they are describing is blind faith, which goes against the very teaching of the Bible. According to the very book they claim to believe, faith defined as something based on tangible evidence. However, much of what they believe has absolutely no tangible evidence.
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