Christian Faith differs from belief in that you can believe something true and be wrong. Faith, on the other hand, has to do with knowing (Faith is the Greek word Pistis), and for something to count as knowledge, it must be true. (ref: Epistimology
A Christian has Faith, because he knows the thing he believes in is true. This makes sense when you read scriptures such as 2 Peter 1:16-19 with other passages like Hebrews 11:1M and Romans 10:17
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as a footnote to this, Faith can be described as submitting yourself to evidence. The Bible provides us knowledge, Faith is the act of accepting it.